fix(NewUserDialog): update group selection to prevent admin group from being assigned as subadmin

Signed-off-by: Arsalan Ul Haq Sohni <arsalan-ul-haq.sohni@strato.de>

apps/settings/src/components/Users/NewUserDialog.vue

@@ -87,7 +87,7 @@
 					:input-label="t('settings', 'Admin of the following groups')"
 					:placeholder="t('settings', 'Set account as admin for …')"
 					:disabled="loading.groups || loading.all"
-					:options="availableGroups"
+					:options="availableSubAdminGroups"
 					:close-on-select="false"
 					:multiple="true"
 					label="name"
@@ -218,6 +218,10 @@ export default {
 			return groups.filter(group => group.id !== '__nc_internal_recent' && group.id !== 'disabled')
 		},
 
+		availableSubAdminGroups() {
+			return this.availableGroups.filter((group) => group.id !== 'admin')
+		},
+
 		languages() {
 			return [
 				{