testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java fail due to new method in Platform.java

A recent change added a new method in test/lib/jdk/test/lib/Platform.java:
public static boolean areCustomLoadersSupportedForCDS()

All boolean methods in the class are tested in testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java and must be explicitly added to one MethodGroup, this was not done for areCustomLoadersSupportedForCDS()