message: Fix colour variable references in composer format bar
diff: @@ -21,7 +21,7 @@ limitations under the License.
  position: absolute;
  cursor: pointer;
  border-radius: 8px;
  - background-color: $primary-bg-color;
  + background-color: $background;
  border: 1px solid $input-border-color;
  user-select: none;
  // equal to z-index of mx_ReplyPreview and mx_RoomView_statusArea (1000)
  @@ -61,11 +61,11 @@ limitations under the License.
  width: 100%;
  mask-repeat: no-repeat;
  mask-position: center;
  - background-color: $secondary-fg-color;
  + background-color: $secondary-content;
  }
  .mx_MessageComposerFormatBar_button:hover::after {
  - background-color: $primary-fg-color;
  + background-color: $primary-content;
  }
  .mx_MessageComposerFormatBar_buttonIconBold::after {
  