Fixes issues stemming from Forge being unable to detect the mod. Namely:
- The "FML has found a non-mod file" warning
- The mod not showing up in the mod list GUI
- The mod not showing up in crash reports
I realized adding compat for this is unnecessary, if someone wants to migrate a
mod to UniMixins, requiring them to change a single line in their mixin config
plugin is not asking much.