Fix OffsetResult.toString()

Fix the string from OffsetResult.toString(): the name, and the amount of
information given about the time zone. ICU's TimeZone.toString() prints
out too much information; only the ID is important.

Also remove fully-qualified calls to java.util.Objects.

Bug: 149014708
Test: build only
Change-Id: I46e6e629956e8ed142e7882b2fce0e6facc6f1bf
1 file changed