message: improve spacing of buttons on RoomPreviewBar
diff: @@ -123,6 +123,11 @@ limitations under the License.
  & > * {
  margin-top: 12px;
  }
  + .mx_AccessibleButton.mx_AccessibleButton_kind_primary {
  + // to account for the padding of the primary button which causes inconsistent look between
  + // subsequent secondary (text) buttons
  + margin-bottom: 7px;
  + }
  }
  }
  