Remove obsolete Android specific Harmony test for the Congo.

This code was originally added in Cupcake to handle what was then a
divergence from standard CLDR data in Android ICU:

https://android.googlesource.com/platform/libcore/+/adc854b/luni/src/test/java/tests/api/java/util/LocaleTest.java

Now when Android has reverted to using standard CLDR data also for the
Congo, it is no longer relevant.

Bug: 35188997
Test: CtsLibcoreTestCases
Change-Id: Iea51d1f1ce251a1ddbb67938c8944340116cc7be