Fix the GATT server and HOGP disconnect

GATT server disconnect and HOGP disconnect are not working after the
following commit: bd9e1ef1.

‘BTA_GATTS_CancelOpen’ makes ‘gatt_update_app_hold_link_status’
return FALSE value. As a result, ‘BTA_GATTS_Close’ cannot disconnect
the link. The sequence has to be changed like GATT client.

And the above mentioned fix removed ‘found’ checking routine in
‘gatt_update_app_hold_link_status’.

It makes two app hold links with same gatt_if when HOGP is connected and
background connection is added. But HOGP disconnect removes only one held
link. So HOGP is never disconnected.

The ‘found’ checking routine has to be rolled back.

Test: manual
Change-Id: Ibea825b5cc844195f0cf4a30cbcca831880c9088