PEAR/ValidDefaultValue: add test for properties with asymmetric visibility

This sniff already handles this correctly.
This commit just updates a test to safeguard this for the future.

Author: jrfnl

src/Standards/PEAR/Tests/Functions/ValidDefaultValueUnitTest.1.inc

@@ -109,7 +109,7 @@ class OnlyConstructorPropertyPromotion {
 
 class ConstructorPropertyPromotionMixedWithNormalParams {
     public function __construct(
-        public string $name = '',
+        public(set) string $name = '',
         ?int $optionalParam = 0,
         mixed $requiredParam,
     ) {}