builtin-remote: make get_remote_ref_states() always populate states.tracked

builtin-remote: make get_remote_ref_states() always populate states.tracked

When not querying the remote, show() was having to populate
states.tracked itself. It makes more sense for get_remote_ref_states()
to do this consistently. Since show() is the only caller of
get_remote_ref_states() with query=0, this change does not affect
other callers.

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>