relocate validate method, fixes #4904

Closes #4904

Merge request studip/studip!3678

resources/vue/components/admission/CourseMemberAdmission.vue

@@ -81,7 +81,6 @@ export default {
             this.courseList = data.attributes.payload.courses;
             this.theMode = data.attributes.payload.modus;
         },
-    },
         validate() {
             if (this.courseList.length === 0) {
                 this.invalidData.push(this.$gettext('Bitte geben Sie mindestens eine Veranstaltung an.'));
@@ -89,6 +88,7 @@ export default {
 
             return this.invalidData.length === 0;
         },
+    },
     mounted() {
         // Get a new rule instance so we can use quicksearch.
         if (!this.id || this.id === '') {