Update OOjs UI to v0.1.0-pre (7d3223b8f4)

6c3e183 Add icons demo
f285a06 build: Concatenation task should not include 'default' in a variant
7d3223b Fix for clearing items in a group element

Change-Id: I8f1b59806b25f5d6a1431e77d654259385245b91