Remove stale search result about "Recent location requests" page

Based on the new design, RecentLocationRequestSeeAllFragment was no
longer used on Location, but it still implemented the indexable
interface to provide stale search result “Recent location requests”
to Settings Search.

Remove the indexable interface from RecentLocationRequestSeeAllFragment
as a quick fix and also correct the related test method name.

Fixes: 192542283
Test: visual
Change-Id: I1a3df5d7319b8831db2f3d3abba19a11b5a83c81