[SB] Don't crop Burmese characters in status bar clock.

Previously, we force-set the clock height to the font height in order to
fix font scaling (see I653584d5963b38ce2ef2ba05ca9df63280aac128,
b/298064328, and b/291168760). However, that font height doesn't take
into account characters that might descend below the baseline. That
wasn't a problem for Western arabic numerals, but is a problem for other
locales like Burmese.

It looks like setting a minimum height on the Clock and not
force-setting the height to the font height fixes b/373765578 without
regressing on b/298064328 or b/291168760.

Fixes: 373765578
Flag: EXEMPT bugfix
Test: With Western arabic numeral clock, verify clock is always
centered with notification icons. Increase & decrease font & display
size, verify clock size increases & decreases size at the same rate as
notification icons.
Test: With Burmese numeral clock, verify the same

Change-Id: I96ae59b5f4123d5f7a31189e408320b6d962a704