fix current_shift respect registration state

shiftregister/app/models.py

@@ -82,7 +82,12 @@ class Helper(models.Model):
                     output_field=models.DateTimeField(),
                 )
             )
-            .filter(helper=self, shift_end__gte=timezone.now(), shift__deleted=False)
+            .filter(
+                helper=self,
+                shift_end__gte=timezone.now(),
+                shift__deleted=False,
+                state__in=[ShiftRegistration.REGISTERED, ShiftRegistration.CHECKED_IN],
+            )
             .order_by("shift__start_at")
             .first()
         )