test(policy): align runtime source assertions with decoded accessor

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/php/Unit/Service/Policy/Runtime/PolicySourceTest.php

@@ -285,7 +285,7 @@ public function testSaveGroupPolicyCreatesPermissionSetAndBinding(): void {
 						'visibleToChild' => true,
 						'allowedValues' => ['ordered_numeric'],
 					],
-				], $permissionSet->getPolicyJson());
+				], $permissionSet->getDecodedPolicyJson());
 				return true;
 			}))
 			->willReturnCallback(static function (PermissionSet $permissionSet): PermissionSet {