obexd: Fix SetPath response
obexd: Fix SetPath response

This fixes the issue, that failed attempts to the OBEX SetPath command
are not propagated through the D-Bus API.

Trace:

  method call sender=:1.942 -> dest=:1.934 serial=8
  path=/org/bluez/obex/client/session3;
  interface=org.bluez.obex.MessageAccess1; member=SetFolder
     string "test"
  method return sender=:1.934 -> dest=:1.942 reply_serial=8

  method call sender=:1.946 -> dest=:1.945 serial=8
  path=/org/bluez/obex/client/session0;
  interface=org.bluez.obex.MessageAccess1; member=SetFolder
     string "test"
  error sender=:1.945 -> dest=:1.946
  error_name=org.bluez.obex.Error.Failed reply_serial=8
     string "Not Found"

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