Don't call consumer_info anymore if not necessary (bug 1081018)

It's only necessary if we don't know the user region (consumer_info API will do geoip) or if the user is logged in (consumer_info API contains the list of apps he's installed/developed/purchased)

https://bugzilla.mozilla.org/show_bug.cgi?id=1081018
in `main.js`, when we regain visibility, to update the apps list for the user even though we already have a region.