Set minDate for end_date-datepicker

frontend/src/routes/sponsor/guest/newGuestRole/index.tsx

@@ -315,6 +315,7 @@ function NewGuestRole({ guest, reloadGuestInfo }: NewGuestRoleProps) {
                 label={t('input.roleEndDate')}
                 disabled={!roleTypeChoice}
                 value={endDate}
+                minDate={today}
                 maxDate={maxDate}
                 inputFormat="yyyy-MM-dd"
                 onChange={(value) => {