Reset snack message when hiding.

This is so that the same message will cause the snack
to be shown again.

lib/www/client/source/src/App.vue

@@ -65,6 +65,16 @@ export default {
 
     snackText (newVal) {
       this.snack = !!newVal;
+    },
+    
+    snack (newVal) {
+      // When the snack is hidden (one way or another), clear
+      // the text so that if we receive the same message again
+      // afterwards it will be shown. This way, if we get spammed
+      // we're also not triggering the snack too often.
+      if (!newVal) {
+        this.$store.commit('setSnackText', "");
+      }
     }
   },