Update GeoTZ strings.

Change button title to "Use location to set time zone" and
summary text to "Automatic time zone is off" when
"Set time zone automatically" is off.

Bug: 152746236
Test: checked UI manually
Merged-In: Iab177297e9047ff3b6e9452876061cdaa0740ef1
Change-Id: Iab177297e9047ff3b6e9452876061cdaa0740ef1
(cherry picked from commit fa79ee67)