Test MetaUtil methods toInternalName & internalNameToJava

Removes the previous test that was comparing the internal name's suffix
that returned by toJavaName().

As of 7cc13710
InnerClassLambdaMetafactory is generating hidden classes instead of
anonymous ones for lambdas and in hidden classes the internal name's
suffix needs to be converted. E.g. Foo$$Lambda$217.0x0000000800d40df0 in
com/example/Foo$$Lambda$217.0x0000000800d40df0 needs to become
Foo$$Lambda$217/0x0000000800d40df0, while previously it was already
Foo$$Lambda$217/0x0000000800d40df0