Avoid depending on 24-hour settings in SimpleDateFormatTest

Bug: 80062293
Test: adb shell settings put system time_12_24 24
cts-tradefed run cts-dev -m CtsLibcoreTestCases -t libcore.java.text.SimpleDateFormatTest
adb shell settings delete system time_12_24

Change-Id: I1d9675ab41b184eb7449b567b828495eece3ab87
1 file changed