Revert "Moves ui-toggle-expansion down to arrow and title"

This reverts commit ff0fd5f949eb9af66f2430acb0fdf4438a1d4b12.

Revert "Fixes failing jasmine tests"

This reverts commit 9da696eaa1daf3180280a7c2adaebcb977fb71c1.
Stop propagation of clicks in XBlockStringFieldEditor