Fix supplier_user being unique for each supplier and id, fix search looking for users with a supplier_id

app/Http/Controllers/UserController.php

@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use Carbon\Carbon;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Session;
+use Illuminate\Validation\Rule;
 
 use App\Models\{Supplier,User};
 
@@ -22,7 +23,7 @@ class UserController extends Controller
 		Session::put('supplier_update',true);
 
 		$validated = $request->validate([
-			'id'=>'required|string',
+			'id'=> ['required','string',Rule::unique('supplier_user')->where(fn ($query) => $query->where('supplier_id',$request->supplier_id)->where('user_id','<>',$o->id))],
 			'supplier_id'=>'required|exists:suppliers,id',
 		]);