Bluetooth: Simplify UUIDs clearing code

The code for clearing the UUIDs list can be simplified by using
list_for_each_entry_safe instead of list_for_each_safe.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>