Removed the concept of silencing.

Nothing really implemented it properly or checked for it and the places that did check just handled it as a slightly softer ban.
It's pretty obvious that the existence of this feature was directly taken from osu! where the differentation between a ban and a silence probably makes more sense, though even there Silences are just non-permanent bans, so like why does this exist lol?
Well, it doesn't anymore! Hopefully chat will upgrade successfully because I let it get 18 commits behind :D

assets/misuzu.css/profile/warning.css

@@ -11,10 +11,6 @@
     --accent-colour: #666;
 }
 
-.profile__warning--silence {
-    --accent-colour: #f70;
-}
-
 .profile__warning--ban {
     --accent-colour: #c33;
 }
@@ -136,4 +132,4 @@
     .profile__warning__options {
         justify-content: flex-start;
     }
-}
+}