Manually deleted schedules

[github0013]

"debounce_key" has an expiry, but this redis key will be deleted only when the expiry is over.

sidekiq-debounce/lib/sidekiq/debounce.rb

Line 37 in c1b1779

conn.expireat(debounce_key, time.to_i)

If a scheduled job is manually deleted (either from API or webUI) BEFORE its expiry, since the debounce_key will still be there in redis, the worker's perform_in will just be ignored, instead of creating a new job.

Adding this line is the main purpose of this PR.
https://github.com/github0013/sidekiq-debounce/blob/1009766b5556b03e5efd72cfe777f8df57fadc58/lib/sidekiq/debounce.rb#L22

[houndci-bot]

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.rubocop.yml: Style/DotPosition has the wrong namespace - should be Layout

.rubocop.yml: Style/DotPosition has the wrong namespace - should be Layout
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.rubocop.yml: Style/SpaceBeforeComment has the wrong namespace - should be Layout
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.rubocop.yml: Style/TrailingWhitespace has the wrong namespace - should be Layout
.rubocop.yml: Lint/Eval has the wrong namespace - should be Security
Error: The `Style/TrailingComma` cop no longer exists. Please use `Style/TrailingCommaInArguments`, `Style/TrailingCommaInArrayLiteral`, and/or `Style/TrailingCommaInHashLiteral` instead.
(obsolete configuration found in .rubocop.yml, please update it)
The `Style/SingleSpaceBeforeFirstArg` cop has been renamed to `Layout/SpaceBeforeFirstArg`.
The `Style/SpaceAfterControlKeyword` cop has been removed. Please use `Layout/SpaceAroundKeyword` instead.
The `Style/SpaceBeforeModifierKeyword` cop has been removed. Please use `Layout/SpaceAroundKeyword` instead.
The `Style/DeprecatedHashMethods` cop has been renamed to `Style/PreferredHashMethods`.
obsolete parameter MaxLineLength (for Style/IfUnlessModifier) found in .rubocop.yml
`Style/IfUnlessModifier: MaxLineLength` has been removed. Use `Metrics/LineLength: Max` instead
obsolete parameter RunRailsCops (for AllCops) found in .rubocop.yml
Use the following configuration instead:
Rails:
  Enabled: true