[android] Enable locale test which actually works on Android.
[android] Enable locale test which actually works on Android.

Maybe the test was disabled because ICU wasn't available then, but
currently the test simply works.

This should not affect Darwin or Linux in any way.

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation