fixes misunderstanding of the error message

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

apps/provisioning_api/lib/Controller/UsersController.php

@@ -773,7 +773,7 @@ public function removeFromGroup(string $userId, string $groupid): DataResponse {
 
 			if (count($userSubAdminGroups) <= 1) {
 				// Subadmin must not be able to remove a user from all their subadmin groups.
-				throw new OCSException('Cannot remove user from this group as this is the only remaining group you are a SubAdmin of', 105);
+				throw new OCSException('Not viable to remove user from the last group you are SubAdmin of', 105);
 			}
 		}
 

apps/provisioning_api/tests/Controller/UsersControllerTest.php

@@ -2516,7 +2516,7 @@ public function testRemoveFromGroupAsSubAdminFromSubAdmin() {
 	/**
 	 * @expectedException \OCP\AppFramework\OCS\OCSException
 	 * @expectedExceptionCode 105
-	 * @expectedExceptionMessage Cannot remove user from this group as this is the only remaining group you are a SubAdmin of
+	 * @expectedExceptionMessage Not viable to remove user from the last group you are SubAdmin o
 	 */
 	public function testRemoveFromGroupAsSubAdminFromLastSubAdminGroup() {
 		$loggedInUser = $this->getMockBuilder(IUser::class)->disableOriginalConstructor()->getMock();