message: align (+) button and aggregated badge on section header
diff: @@ -73,10 +73,13 @@ limitations under the License.
  filter: brightness($focus-brightness);
  }
  +.mx_RoomSubList_addRoom, .mx_RoomSubList_badge {
  + margin: 5px;
  +}
  +
  .mx_RoomSubList_addRoom {
  background-color: $roomheader-addroom-color;
  color: $roomsublist-background;
  - margin: 5px 10px;
  border-radius: 9px;
  text-align: center;
  vertical-align: middle;
  