Remove 2 unused search related messages

Follows-up 7e8c48ac3d11 by removing 'powersearch-redir'.
Follows-up 11c04f9ecbaf by removing 'prefs-displaysearchoptions'.

Change-Id: I13ce4eb1f9431e23f983ec737a684213d1dcd235
Merge "Remove 2 unused search related messages"