Lock suggestions_filter_enabled as true

Most/all of the work we're doing in this method is done at creation/edit
time, so do we need to also check at render? Assume if you've gotten to
this point, it's ok to enable the suggestion filter.

app/models/diff_note.rb

@@ -90,7 +90,7 @@ class DiffNote < Note
   end
 
   def banzai_render_context(field)
-    super.merge(project: project, suggestions_filter_enabled: supports_suggestion?)
+    super.merge(suggestions_filter_enabled: true)
   end
 
   private