audio/media: Fix crash while changing repeat mode
audio/media: Fix crash while changing repeat mode

By changing repeat mode to 'group' which does not have a direct
translation to MPRIS LoopStatus will cause the following crash:

_dbus_abort () from /usr/lib/libdbus-1.so.3
_dbus_warn_check_failed () from /usr/lib/libdbus-1.so.3
dbus_message_iter_append_basic () from /usr/lib/libdbus-1.so.3
set_repeat_setting (key=0x80d6a87 "Repeat", value=0x80d8079 "group", user_data=0x984ab40) at profiles/audio/media.c:1050

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