fix: stop using old config for logo image url on login page

tailbone/views/auth.py

@@ -94,10 +94,6 @@ class AuthenticationView(View):
             else:
                 self.request.session.flash("Invalid username or password", 'error')
 
-        image_url = self.rattail_config.get(
-            'tailbone', 'main_image_url',
-            default=self.request.static_url('tailbone:static/img/home_logo.png'))
-
         # nb. hacky..but necessary, to add the refs, for autofocus
         # (also add key handler, so ENTER acts like TAB)
         dform = form.make_deform_form()
@@ -110,7 +106,6 @@ class AuthenticationView(View):
         return {
             'form': form,
             'referrer': referrer,
-            'image_url': image_url,
             'index_title': app.get_node_title(),
             'help_url': global_help_url(self.rattail_config),
         }