comments: put sticky option in popup menu instead of in edit form.

Put the option to sticky a comment in the "..." popup menu instead of
in the comment edit form. This makes it more consistent with deleting or
undeleting a comment.

Also fix a bug where the comment undelete icon didn't show up due to a
typo.

app/components/comment_component.rb

@@ -2,7 +2,6 @@
 
 class CommentComponent < ApplicationComponent
   attr_reader :comment, :context, :dtext_data, :current_user
-  delegate :link_to_user, :time_ago_in_words_tagged, :format_text, :edit_icon, :delete_icon, :undelete_icon, :flag_icon, :upvote_icon, :downvote_icon, :link_icon, to: :helpers
 
   def initialize(comment:, current_user:, context: nil, dtext_data: nil)
     @comment = comment