message: fix(scss): added min-width variable
diff: @import '../../globals/imports';
  @import '@carbon/ibmdotcom-styles/scss/components/buttongroup/_buttongroup.scss';
  +$btn-min-width: 26;
  +
  @function aspectratio($height, $width) {
  $ratio: carbon--rem($height) / carbon--rem($width) * 100%;
  @return $ratio;
  @include themed-items;
  }
  + .#{$prefix}--btn {
  + min-width: carbon--mini-units($btn-min-width);
  + }
  +
  .#{$prefix}--leadspace--g100 {
  @include carbon--theme($carbon--theme--g100) {
  @include themed-items;
  