cleanup: automatically expand the Triple Tap shortcut if enabled

This shortcut affects touch responsiveness so lets make sure that anyone
with it already enabled can see that it is enabled with no effort.

Fix: 328506957
Flag: EXEMPT low risk bugfix
Test: atest EditShortcutsPreferenceFragmentTest
Test: manually enable the shortcut, observe that the preference is
      expanded by default
Change-Id: I49529e42af2b15266c795cba0b1d5129895d7e87