obexd: Fix aborting capability scripts making them zombies processes
obexd: Fix aborting capability scripts making them zombies processes

When using G_SPAWN_DO_NOT_REAP_CHILD the watch cannot be removed since it
basically replaces the use of waitpid which does prevent the child
process to became 'zombie' when terminated, a more detailed explanation
can be found in waitpid manpage.

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