Fixes Moth Language Bind (#2414)

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## About The Pull Request

Resolves #2407 by
removing the overlap between mouse and moth language binds.

## Why It's Good For The Game

Squashes bugs (the nasty kind, not the lovable kind).
You can now #%,m once again without destroying your immersion. Rejoice!

## Changelog

:cl:
fix: moth language bind now works as intended
/:cl:

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code/modules/language/mouse.dm

@@ -4,7 +4,7 @@
 	speech_verb = "squeaks"
 	ask_verb = "squeaks"
 	exclaim_verb = "squeaks"
-	key = "m"
+	key = "l"
 	flags = NO_STUTTER | LANGUAGE_HIDE_ICON_IF_NOT_UNDERSTOOD | LANGUAGE_HIDE_ICON_IF_UNDERSTOOD
 
 /datum/language/mouse/scramble(input)