Change assets.moz.works to assets.mozilla.net
Change assets.moz.works to assets.mozilla.net

The latter is the proper production domain.

Fix #512

glogiotatidis/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,glogiotatidis/lumbergh,mozilla/lumbergh,mozilla/lumbergh