Use *actual* current URL for user feedback msg

was using current URL as of page load, but #hash can change after
that, e.g. on profile view

tailbone/static/js/tailbone.feedback.js

@@ -12,6 +12,7 @@ let FeedbackForm = {
         },
 
         showFeedback() {
+            this.referrer = location.href
             this.showDialog = true
             this.$nextTick(function() {
                 this.$refs.textarea.focus()

tailbone/templates/base.mako

@@ -485,6 +485,7 @@
 
   ${page_help.render_template()}
 
+  % if request.has_perm('common.feedback'):
   <script type="text/x-template" id="feedback-template">
     <div>
 
@@ -570,6 +571,7 @@
 
     </div>
   </script>
+  % endif
 
   ${tailbone_autocomplete_template()}
   ${multi_file_upload.render_template()}
@@ -882,8 +884,6 @@
 <%def name="modify_whole_page_vars()">
   <script type="text/javascript">
 
-    FeedbackFormData.referrer = location.href
-
     % if request.user:
     FeedbackFormData.userUUID = ${json.dumps(request.user.uuid)|n}
     FeedbackFormData.userName = ${json.dumps(six.text_type(request.user))|n}