QuickSearch.vue: reset input after selection, fixes #3963

Closes #3963

Merge request studip/studip!2876


(cherry picked from commit 203eb5a9)

377d7471 QuickSearch.vue: reset input after selection

resources/vue/components/Quicksearch.vue

@@ -119,6 +119,7 @@ export default {
             this.results = [];
 
             this.$emit('input', this.returnValue, this.inputValue);
+            this.inputValue = '';
         },
         selectUp () {
             if (this.selected > 0) {