fix add customer

Modules/Agents/Services/AgentService.php

@@ -187,7 +187,7 @@ class AgentService
                     continue; // skip agent root
 
                 if (!empty($input['up_grant'])) { // if existing up_geant
-                    if ($upGrant != $input['up_grant'])
+                    if (strtolower($upGrant) != strtolower($input['up_grant']))
                         continue; // skip
                 }
 
@@ -286,7 +286,7 @@ class AgentService
                     $upGrant = $agentParent->code ?? null;
                 }
                 if (!empty($input['up_grant'])) { // if existing up_geant
-                    if ($upGrant != $input['up_grant'])
+                    if (strtolower($upGrant) != strtolower($input['up_grant']))
                         continue; // skip
                 }
                 // lay danh sach 2 con cua parent