keyword mute: use mentions scope in home feed filtering (#454)

If a status shows up in mentions because all keyword mutes that might
apply to it are marked as "don't apply to mentions", then it ought to
show up in the home feed also.

spec/lib/feed_manager_spec.rb

@@ -187,6 +187,14 @@ RSpec.describe FeedManager do
 
         expect(FeedManager.instance.filter?(:home, status, alice.id)).to be true
       end
+
+      it 'returns false if the status is muted by a keyword mute that does not apply to mentions' do
+        Fabricate('Glitch::KeywordMute', account: alice, keyword: 'take', apply_to_mentions: false)
+        status = Fabricate(:status, spoiler_text: 'This is a hot take', account: bob)
+        status.mentions.create!(account_id: alice.id)
+
+        expect(FeedManager.instance.filter?(:home, status, alice.id)).to be false
+      end
     end
 
     context 'for mentions feed' do