Fix word counter

resources/ts/components/bo/WordCounterComponent.vue

@@ -46,9 +46,10 @@ export default defineComponent({
         throw new Error("Missing ID");
       }
       const input = document.getElementById(this.id);
-      if (!input) {
+      if (!input || !(input instanceof HTMLInputElement)) {
         throw new Error(`Input ${this.id} could not be found`);
       }
+      this.input = input;
     },
     input() {
       if (!this.input) {