message: fix(scss): removed duplicate code
diff: //
  @mixin listsection-group {
  - .#{$prefix}--listsection-group {
  - &__title {
  - @include type-style('expressive-heading-04');
  -
  - margin-top: $carbon--layout-05;
  - }
  - @include carbon--breakpoint('lg') {
  - &__title {
  - margin-top: $carbon--layout-06;
  - }
  - }
  - }
  -
  .#{$prefix}--content-group__title {
  padding-left: 0;
  }
  