DeliveryAdminWindow: Show modifiers in DataGrid

Elwig/Windows/DeliveryAdminWindow.xaml

@@ -177,6 +177,7 @@
                     </DataGridTextColumn>
                     <DataGridTextColumn Header="LsNr." Binding="{Binding LsNr}" Width="120"/>
                     <DataGridTextColumn Header="Mitglied" Binding="{Binding Member.AdministrativeName}" Width="180"/>
+                    <DataGridTextColumn Header="Zu-/Abschläge" Binding="{Binding FilteredModifiersString}" Width="150"/>
                 </DataGrid.Columns>
             </DataGrid>