Extract partial to refresh flag actions

Now that we're rendering `shared/flag_actions` everywhere, we can use
the same code in all cases.

app/controllers/comments_controller.rb

@@ -36,14 +36,14 @@ class CommentsController < ApplicationController
     Flag.flag(current_user, @comment)
     set_comment_flags(@comment)
 
-    render "comments/_refresh_flag_actions"
+    render "shared/_refresh_flag_actions", locals: { flaggable: @comment, divider: true }
   end
 
   def unflag
     Flag.unflag(current_user, @comment)
     set_comment_flags(@comment)
 
-    render "comments/_refresh_flag_actions"
+    render "shared/_refresh_flag_actions", locals: { flaggable: @comment, divider: true }
   end
 
   private