allow users with delete_diffusion perm to delete diffusions

emissions/forms.py

@@ -365,7 +365,7 @@ class AbsenceForm(forms.ModelForm):
         emission = kwargs.get('initial', {}).get('emission')
         user = kwargs.get('initial', {}).get('user')
         self.fields['datetime'].widget.emission = emission
-        if user and user.is_staff:
+        if (user and user.has_perm('emissions.delete_diffusion')):
             date = emission.get_next_planned_date()
             self.fields['datetime'].initial = date
             self.fields['datetime'].widget = DateTimeWidget()