Remove TimeZoneTest#testSetDefaultRace from blacklist

- The test is no longer time sensitive

Bug: 62528691
Test: cts-tradefed run cts -m CtsLibcoreTestCases --test
libcore.java.util.TimeZoneTest#testSetDefaultRace
Change-Id: I78b5ac6ef475b5565325de6cb6b6d07061169429
1 file changed