Improve invalid cpp modifier message

The ZEND_MODIFIER_TARGET_CPP should really have been called _PARAM, but we
shouldn't break API at this point.

Fixes GH-12069
Closes GH-12175

Author: iluuu1994

Zend/tests/ctor_promotion_additional_modifiers.phpt

@@ -9,4 +9,4 @@ class Test {
 
 ?>
 --EXPECTF--
-Fatal error: Cannot use the static modifier on a promoted property in %s on line %d
+Fatal error: Cannot use the static modifier on a parameter in %s on line %d

Zend/tests/type_declarations/static_type_param.phpt

@@ -12,4 +12,4 @@ class Test {
 
 ?>
 --EXPECTF--
-Fatal error: Cannot use the static modifier on a promoted property in %s on line %d
+Fatal error: Cannot use the static modifier on a parameter in %s on line %d

Zend/zend_compile.c

@@ -869,7 +869,7 @@ uint32_t zend_modifier_token_to_flag(zend_modifier_target target, uint32_t token
 	} else if (target == ZEND_MODIFIER_TARGET_CONSTANT) {
 		member = "class constant";
 	} else if (target == ZEND_MODIFIER_TARGET_CPP) {
-		member = "promoted property";
+		member = "parameter";
 	} else {
 		ZEND_UNREACHABLE();
 	}