Update countryzones.txt / tests to new proto defn

The format was modified in commit
fc880223 but the
countryzones.txt was omitted from the commit
by mistake. This change also updates the associated
host unit tests.

Bug: 72144448
Test: manual: ran update-tzdata.py
Change-Id: Ic7ac6f5fe7cc7bd4061b426e259279d0b6b73362