shared/gatt-client: Call ready_handler only in init
shared/gatt-client: Call ready_handler only in init

Currently disconnect_cb calls ready_handler to notify the upper layer
if a disconnect occurred during initialization. This patch fixes it so
that the handler is only called if in_init is set.

silent-snowman/bluez,pkarasev3/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,mapfau/bluez,silent-snowman/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,mapfau/bluez,ComputeCycles/bluez,mapfau/bluez,ComputeCycles/bluez,silent-snowman/bluez,ComputeCycles/bluez,pkarasev3/bluez,ComputeCycles/bluez,pstglia/external-bluetooth-bluez