fix(settings): env var spelling

shiftregister/settings.py

@@ -176,7 +176,7 @@ CELERY_BEAT_SCHEDULE = {
     },
     "deactivate-fallbacks-every-300-seconds": {
         "task": "shiftregister.fallback.tasks.deactivate_fallbacks",
-        "schedule": float(getenv("FALLBACK_DEACTIVAtE_INTERVAL", 300.0)),  # seconds
+        "schedule": float(getenv("FALLBACK_DEACTIVATE_INTERVAL", 300.0)),  # seconds
     },
 }