Revert edit mode tool's onSelect method

Turns out surfaces don't have access to targets after all.

Bug: 63503
Change-Id: Ib14291ce4efe4b3dd5579cd270828936b6a175ae
(cherry picked from commit 95564675955f73be8fd9c59ae380d28777f5c7db)
Additional initializeSelection methodicde

Changes:

* Change uses of initializeSelection to selectItem
* Use "choose" event to respond to deliberate item selection by the user

Depends on changes in OOJS-UI (Ib3826ed)

Change-Id: Ia167a70ca5f40b1f15adad30620fdb13ef0d02d7
Merge "Additional initializeSelection methodicde" into wmf/1.23wmf21