Update VE core submodule to master (ce4ee02)

New changes:
56c30cb Remove font-size: 0.8em; rule for OOUI change
97d5111 Update OOjs UI to v0.1.0-pre (deccd11549)

Change-Id: I6efd0a9a996ae60404e029748ef71672cd5ab07d
Merge "Update VE core submodule to master (ce4ee02)"