add more type casts

src/views/NewEditAccountView.vue

@@ -45,6 +45,8 @@
 
 <script lang="ts">
 import { Component, Vue } from "vue-facing-decorator";
+import { Router } from "vue-router";
+
 import { db } from "@/db/index";
 import { MASTER_SETTINGS_KEY, Settings } from "@/db/tables/settings";
 
@@ -68,11 +70,11 @@ export default class NewEditAccountView extends Vue {
       firstName: this.givenName,
       lastName: "", // deprecated, pre v 0.1.3
     });
-    this.$router.back();
+    (this.$router as Router).back();
   }
 
   onClickCancel() {
-    this.$router.back();
+    (this.$router as Router).back();
   }
 }
 </script>