Makes Use Color inversion searchable.

Fix: 354773587
Flag: com.android.settings.accessibility.fix_a11y_settings_search
Test: atest ToggleColorInversionPreferenceFragmentTest
Test: adb shell pm clear com.google.android.settings.intelligence;
      search Settings for 'use color inversion', observe 'use color inversion' present;
Change-Id: Iad13fbe163002af6e84a79fdeafb8517d53e2b09