Fix and reenable DecimalFormatTest

The problems underlying the suppressed DecimalFormatTest test cases have
been fixed, but the test had a separate bug where it appropriately
truncated the output for formatting a very large number but didn't scale
it properly, so the test was still failing.

Also fix the bug reference for a different text-formatting suppression.

Bug: 17656132
Test: vogar ...
Test: cts run -m CtsLibcoreTestCases -t
Change-Id: I85266515e6645627f5aa9200c0d1de41f9ac9cc0
2 files changed