Draft: Resolve "Selfclosing components in `vue_base.html` break the page"

Closes #766 (closed)

This doesn't need a changelog entry because this version has never been released.

aleksis/core/templates/core/vue_base.html

@@ -160,7 +160,7 @@
       </v-container>
     </v-main>
 
-    <celery-progress-bottom />
+    <celery-progress-bottom></celery-progress-bottom>
 
     <v-footer app absolute inset dark class="pa-0 d-flex" color="primary lighten-1">
       <v-card