Update search index in UserSettings based on allowed user types

If USER_TYPE_FULL_RESTRICTED is disallowed, addUserPreference is renamed to only mention user. But search results still state default name "Add user or profile". This change updates this entry in the search index.

Bug: 365899560
Test: atest UserSettingsTest#testGetRawDataToIndex_returnAllIndexablePreferences && atest UserSettingsTest#testGetRawDataToIndex_addRestrictedProfileAllowed_addUserTitleIsCorrect && atest UserSettingsTest#testGetRawDataToIndex_addRestrictedProfileDisallowed_addUserTitleIsCorrect
Flag: EXEMPT bugfix_only
Change-Id: I3c26180225491e4916141a3fca9d2e7ab36e8cfc