reload on connect in quizsummarypage; avoid possible error w/ missing…

… data

I could not replicate the issue described in #12388 but this seems like
it ought to avoid the possibility altogether as it only seems to occur
when there is a 502 during the page load.

kolibri/plugins/coach/assets/src/views/plan/QuizSummaryPage/index.vue

@@ -248,7 +248,7 @@
             });
           })
           .catch(error => {
-            this.$store.dispatch('handleApiError', { error });
+            this.$store.dispatch('handleApiError', { error, reloadOnReconnect: true });
           });
       },
     },