Bug 918740 update the Activities system region locators to suit new menu/button style list r=bsilverberg/bebe

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/apps/system/regions/activities.py
Merge pull request #13309 from bobsilverberg/cp918740

Bug 934145 - [v1.2] Update activities region and tests to be in line with master