Add a template variable to hide the subscribe form when editing a Post when the user is subscribed to the parent CS. Updated all PostForm templates to use this new variable. Fixes bug #11626.

lib/WebGUI/Asset/Post.pm

@@ -1633,6 +1633,7 @@ sub www_edit {
     $var{'archive.form'} = WebGUI::Form::yesNo($session, {
         name=>"archive"
     });
+    $var{'isSubscribedToCs'} = $self->getThread->getParent->isSubscribed;
 	$var{'form.header'} .= WebGUI::Form::hidden($session, {
         name=>"proceed", 
         value=>"showConfirmation"