Fix reset cache lors d'un update settings

kfet/forms.py

@@ -396,7 +396,6 @@ class SettingsForm(forms.ModelForm):
                 raise ValidationError('Renseignez une durée')
             self.cleaned_data['value_decimal'] = None
             self.cleaned_data['value_account'] = None
-        cache.delete(name)
         super(SettingsForm, self).clean()
 
 class FilterHistoryForm(forms.Form):

kfet/models.py

@@ -673,7 +673,7 @@ class Settings(models.Model):
     def empty_cache():
         cache.delete_many([
             'SUBVENTION_COF', 'OVERDRAFT_DURATION', 'OVERDRAFT_AMOUNT',
-            'CANCEL_DURATION',
+            'CANCEL_DURATION', 'ADDCOST_AMOUNT', 'ADDCOST_FOR',
         ])
 
 class GenericTeamToken(models.Model):