message: fix(LocaleModal): force white theme
  This change forces local modal to come with white theme (only) for now.
  In future we may consider rendering locale modal outside footer (e.g.
  with React portal) so the zoned theme of footer won't be applied to
  locale modal.
  Refs
diff: /// @group locale-modal
  @mixin locale-modal {
  + .#{$prefix}--locale-modal-container {
  + @include carbon--theme(
  + $carbon--theme--white,
  + feature-flag-enabled('enable-css-custom-properties')
  + ) {
  .#{$prefix}--modal-container {
  background-color: $ui-background;
  + min-height: 80%;
  @media (max-height: rem(450px)) {
  .#{$prefix}--locale-modal__filtering {
  }
  }
  - .#{$prefix}--locale-modal-container .#{$prefix}--modal-container {
  - min-height: 80%;
  - }
  -
  .#{$prefix}--locale-modal {
  padding-left: $carbon--spacing-05;
  margin-bottom: $carbon--spacing-05;
  }
  }
  }
  + }
  +}
  @include exports('locale-modal') {
  @include locale-modal;
  