message: fix when both clear button & showToday button
diff: @@ -64,7 +64,7 @@ export const ModalDialog: React.SFC<ModalDialogProps & WithStyles<typeof styles>
  </Button>
  )}
  - {!clearable && showTodayButton && (
  + {showTodayButton && (
  <Button color="primary" onClick={onSetToday}>
  {todayLabel}
  </Button>
  