How to disable iconify?

[dustojnikhummer]

Is your feature request related to a problem? Please describe.
I would like to disable iconify's automatic icon adding for external links

Specifically this

body.cyborg a.urlextern, body.darkly a.urlextern, body.slate a.urlextern, body.superhero a.urlextern, body.solar a.urlextern { background-image: url(/lib/tpl/bootstrap3/iconify.php?icon=mdi-earth-arrow-right.svg&color=%23ffffff) !important; }

Describe the solution you'd like
Toggle in Configuration Settings to disable Iconify

Describe alternatives you've considered
I would edit iconify.php but it says "This file will be deleted on every upgrade of template" so I assume it isn't persistent?
I did try userstyle but it seems like iconify.php takes priority

Additional context
This is my first time encountering iconify, if there is an obvious way to disable it please share.