Update VE core submodule to master (89820e5)

Remove clickable node mixins.

New changes:
65e2e22 [BREAKING CHANGE] Make all focusable nodes clickable

Change-Id: I24403e12621e5b789e0b8c99f54f1d1b8fa802cc
Merge "Update VE core submodule to master (89820e5)"