Merge pull request #21877 from etiennesegonzac/bug-1036642

Bug 1036642 - Enable access to the rocketbar while on a call. r=21
(cherry picked from commit 946c019bd52af3de71895e8a7c54c48e58ad6bf1)

Conflicts:
	apps/system/js/home_searchbar.js
	apps/system/test/unit/rocketbar_test.js
Merge pull request #22063 from etiennesegonzac/bug-1036642-2.0-uplift

bug-1036642 uplift to 2.0