Search results always highlight proper results

In fragments where preferences were being injected after
the super#onResume, the incorrect preference was
being highlighted as the selected result.

This is because the index of the preference is calculated
in SettingsPreferenceFragment#onResume, but the index is
not checked again before the item is highlighted.

Instead, we calculate index right before we highlight.

Change-Id: Idaa655f682a1a6186c1996fb51d352589bbeda0f
Fixes: 62179739
Test: runtest --path packages/apps/Settings/tests/app/src/com/android/settings/SettingsPreferenceFragmentTest.java