Fix mod_event_pusher_push MUC Light error

[gustawlippa]

When a stanza was addressed to a room, there were errors in the logs due to a failed hook filter_local_packet running with To being the sender (mod_event_pusher:push_event/3 failed on the ETS lookup, because the name was expecting a Host, not a MUC Light host). The problem originates from the fact, that filter_local_packet is called twice when processing a MUC Light message (see the comment).

From what I understand, this change would mean that the notification will be processed (maybe tried to be sent?) in the context of the room - "to" the room itself.

[mongoose-im]

small_tests_24 / small_tests / f2843c8
Reports root / small

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small_tests_23 / small_tests / f2843c8
Reports root / small

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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / f2843c8
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_24 / mysql_redis / f2843c8
Reports root/ big
OK: 2674 / Failed: 0 / User-skipped: 255 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_23 / pgsql_mnesia / f2843c8
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / f2843c8
Reports root/ big
OK: 2691 / Failed: 0 / User-skipped: 238 / Auto-skipped: 0

---

ldap_mnesia_23 / ldap_mnesia / f2843c8
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 390 / Auto-skipped: 0

---

ldap_mnesia_24 / ldap_mnesia / f2843c8
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 390 / Auto-skipped: 0

---

internal_mnesia_24 / internal_mnesia / f2843c8
Reports root/ big
OK: 1541 / Failed: 0 / User-skipped: 349 / Auto-skipped: 0

---

mssql_mnesia_24 / odbc_mssql_mnesia / f2843c8
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

---

pgsql_mnesia_23 / pgsql_mnesia / f2843c8
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

---

mysql_redis_24 / mysql_redis / f2843c8
Reports root/ big
OK: 3073 / Failed: 0 / User-skipped: 252 / Auto-skipped: 0

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elasticsearch_and_cassandra_24 / elasticsearch_and_cassandra_mnesia / f2843c8
Reports root/ big
OK: 1834 / Failed: 0 / User-skipped: 363 / Auto-skipped: 0

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pgsql_mnesia_24 / pgsql_mnesia / f2843c8
Reports root/ big
OK: 3078 / Failed: 0 / User-skipped: 247 / Auto-skipped: 0

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riak_mnesia_24 / riak_mnesia / f2843c8
Reports root/ big
OK: 1680 / Failed: 0 / User-skipped: 363 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #3526 (f2843c8) into master (cc4c859) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3526   +/-   ##
=======================================
  Coverage   81.06%   81.07%           
=======================================
  Files         419      419           
  Lines       32297    32298    +1     
=======================================
+ Hits        26183    26187    +4     
+ Misses       6114     6111    -3     

Impacted Files	Coverage Δ
.../event_pusher/mod_event_pusher_hook_translator.erl	88.88% <100.00%> (+0.31%)	⬆️
src/elasticsearch/mongoose_elasticsearch.erl	76.92% <0.00%> (-7.70%)	⬇️
src/mam/mod_mam_elasticsearch_arch.erl	85.08% <0.00%> (-1.76%)	⬇️
src/rdbms/mongoose_rdbms.erl	62.17% <0.00%> (-1.13%)	⬇️
src/mam/mod_mam_rdbms_arch_async.erl	96.66% <0.00%> (-1.12%)	⬇️
src/pubsub/mod_pubsub.erl	73.13% <0.00%> (-0.36%)	⬇️
src/mod_roster.erl	78.75% <0.00%> (-0.24%)	⬇️
src/domain/mongoose_domain_loader.erl	90.17% <0.00%> (+0.89%)	⬆️
src/muc_light/mod_muc_light_db_mnesia.erl	90.52% <0.00%> (+1.05%)	⬆️
src/logger/mongoose_log_filter.erl	79.45% <0.00%> (+1.36%)	⬆️
... and 5 more

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[gustawlippa]

Todo: compare whether #3551 is not a better solution.
When merged, either of them should fix #3407.