FIX: Edit title respects min trust to edit post

This fix ensures that the site setting `post_edit_time_limit` does not
bypass the limit of the site setting `min_trust_to_edit_post`. This
prevents a bug where users that did not meet the minimum trust level to
edit could edit the title of topics.

spec/components/guardian_spec.rb

@@ -1362,6 +1362,13 @@ describe Guardian do
         expect(Guardian.new(trust_level_4).can_edit?(post)).to eq(false)
       end
 
+      it 'returns false when trying to edit a topic with no trust' do
+        SiteSetting.min_trust_to_edit_post = 2
+        post.user.trust_level = 1
+
+        expect(Guardian.new(topic.user).can_edit?(topic)).to be_falsey
+      end
+
       it 'returns false when trying to edit a post with no trust' do
         SiteSetting.min_trust_to_edit_post = 2
         post.user.trust_level = 1