Bluetooth: hci_sync: Fix hci_resume_advertising_sync

hci_resume_advertising_sync is suppose to resume all instance paused by
hci_pause_advertising_sync, this logic is used for procedures are only
allowed when not advertising, but instance 0x00 was not being
re-enabled.

Fixes: ad383c2c ("Bluetooth: hci_sync: Enable advertising when LL privacy is enabled")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>