gpo: Pass necessary parameters to rsop

gpo: Pass necessary parameters to rsop

These parameters were missed by mistake when exts
were modified to be initialized within the rsop
command. Fixes an exception thrown when executing
samba-gpupdate --rsop:

Traceback (most recent call last):
  File "/usr/sbin/samba-gpupdate", line 99, in <module>
    rsop(lp, creds, gp_extensions, opts.target)
  File "/usr/lib64/python3.8/site-packages/samba/gpclass.py", line 512, in rsop
    ext = ext(logger, lp, creds, store)
NameError: name 'logger' is not defined

Signed-off-by: David Mulder <dmulder@suse.com>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>