Append each processed ad to the output list when method="offsets", ot…

…herwise all the files after the first one get dropped!

geminidr/core/primitives_register.py

@@ -158,6 +158,7 @@ def adjustWCSToReference(self, adinputs=None, **params):
                 msg += warnings[fallback]
                 log.stdinfo(msg)
                 _create_wcs_from_offsets(ad, adref)
+                adoutputs.append(ad)
                 continue
 
             # GNIRS WCS is dubious, so update WCS by using the ref