message: feat(datepicker): updated icons and spacing
diff: .#{$prefix}--date-picker.#{$prefix}--date-picker--simple {
  .#{$prefix}--date-picker__input {
  - width: rem(125px);
  + width: rem(128px);
  }
  }
  +
  + .#{$prefix}--date-picker__icon {
  + width: rem(20px);
  + height: rem(20px);
  + }
  +
  + .#{$prefix}--date-picker--range .#{$prefix}--date-picker-container,
  + .#{$prefix}--date-picker--range .#{$prefix}--date-picker__input {
  + width: rem(160px);
  + }
  +
  + .flatpickr-prev-month svg,
  + .flatpickr-next-month svg {
  + width: rem(20px);
  + height: rem(20px);
  + }
  }
  