Fixed variable name

Signed-off-by: snipe <[email protected]>

app/Http/Controllers/Users/BulkUsersController.php

@@ -323,7 +323,7 @@ protected function logItemCheckinAndDelete($items, $itemType)
             $logAction->item_type = $itemType;
             $logAction->target_id = $item->assigned_to;
             $logAction->target_type = User::class;
-            $logAction->created_at = auth()->id();
+            $logAction->created_by = auth()->id();
             $logAction->note = 'Bulk checkin items';
             $logAction->logaction('checkin from');
         }