Update OOjs UI to v0.1.0-pre (20c61ec865)

New changes:
20c61ec Follow-up Id9597fde: Restore toolbar-bar class

Change-Id: Ia16292b3ee46f5b38ee216927a9796a8fdf9235d
Merge "Update OOjs UI to v0.1.0-pre (20c61ec865)"