Use same style for all notifications, better error message

src/plugins/user/components/settings/MainUserSettings.vue

@@ -177,9 +177,14 @@ export default defineComponent({
     const avatar = ref<string>('');
     function onAvatarRejected() {
       Notify.create({
-        color: 'negative',
+        group: false,
-        message: 'Ungültige Bilddatei',
+        type: 'negative',
+        message: 'Datei zu groß oder keine gültige Bilddatei.',
+        timeout: 10000,
+        progress: true,
+        actions: [{ icon: 'mdi-close', color: 'white' }],
       });
+      avatar.value = '';
     }
 
     const allRoles = computed(() =>