Restore the (inactive) YouTube and Reddit search plugins on Android
In 5824c2dc, we delete the Reddit and Youtube search plugins:
mobile/android/fenix/app/src/main/assets/searchplugins/reddit.xmlmobile/android/fenix/app/src/main/assets/searchplugins/youtube.xml
I don't think they're actually relevant, as we customize our search settings elsewhere.
I think we could restore those files to simplify our patchset (just a little bit).