Simplification

* simplifies fetching of intervention's deductions

intervention/models/intervention.py

@@ -312,9 +312,7 @@ class Intervention(BaseObject,
         super().mark_as_deleted(user, send_mail)
 
         # Remove pending deductions to free booked capacities
-        deductions = EcoAccountDeduction.objects.filter(
-            intervention=self
-        )
+        deductions = self.deductions.all()
         # Remove one by one instead of bulk to trigger EcoAccountDeduction custom delete() logic
         for deduction in deductions:
             deduction.delete()