Revert "Bug 1044231 - Xfail test_everything_me_launch_link.py a=testonly r=me"

This reverts commit e95ac19a89b858528031a90d688bf39ff7dcf0a3.
Bug 1043293 - Simplify launch icon utility r=julienw
Bug 1043293 - [Verticalhome] use "touchend" instead of "click" to launch applications r=crdlc
followups:

* attach the scroll event on the main window
click -> tap