Move KeywordMute into Glitch namespace.

There are two motivations for this:

1. It looks like we're going to add other features that require
   server-side storage (e.g. user notes).

2. Namespacing glitchsoc modifications is a good idea anyway: even if we
   do not end up doing (1), if upstream introduces a keyword-mute feature
   that also uses a "KeywordMute" model, we can avoid some merge
   conflicts this way and work on the more interesting task of
   choosing which implementation to use.

app/controllers/settings/keyword_mutes_controller.rb

@@ -55,7 +55,7 @@ class Settings::KeywordMutesController < ApplicationController
   end
 
   def keyword_mutes_for_account
-    KeywordMute.where(account: @account)
+    Glitch::KeywordMute.where(account: @account)
   end
 
   def load_keyword_mute