Change showSoftKeyboard to use SHOW_FORCED.

The keyboard wasn't always showing when this method was called because it used
SHOW_IMPLICIT instead of SHOW_FORCED. This should fix a few bugs relating to
the keyboard not showing.

BUG: 66816
Change-Id: I34f06280388d0f3fc4dedb1903a884c56d1f5577
Merge "Change showSoftKeyboard to use SHOW_FORCED."