really pass shift_type with proper format to create_coop_shift_subscription…

really pass shift_type with proper format to create_coop_shift_subscription (where is bug actually is)

members/admin.py

@@ -589,7 +589,7 @@ def shift_subscription(request):
                 m.unsubscribe_member_but_exogenous_makeups()
         reg_id = m.create_coop_shift_subscription(
             curated_data["target_shift_template_id"],
-            curated_data["target_shift_type"]
+            data["shift_type"]
         )
         # Return necessary data
         if reg_id is not None: