Change celery tasks to shared task decorator

allianceauth/corputils/tasks.py

@@ -1,14 +1,14 @@
-from allianceauth.celery import app
+from celery import shared_task
 from allianceauth.corputils import CorpStats
 
 
-@app.task
+@shared_task
 def update_corpstats(pk):
     cs = CorpStats.objects.get(pk=pk)
     cs.update()
 
 
-@app.task
+@shared_task
 def update_all_corpstats():
     for cs in CorpStats.objects.all():
         update_corpstats.delay(cs.pk)