QModal no imposed value prop changes on route change fix quasarframework#1502 (quasarframework#1503)

* QModal Respect Value Prop on Route Change

* value undefined

* Update model-toggle.js

* Update QModal.js

Author: realcarbonneau

src/components/modal/QModal.js

@@ -78,7 +78,9 @@ export default {
   },
   watch: {
     $route () {
-      this.hide()
+      if (this.value === void 0) {
+        this.hide()
+      }
     }
   },
   computed: {