Stop hardcoding carrier for some regions (bug 1061716)

https://bugzilla.mozilla.org/show_bug.cgi?id=1061716

This was introduced in 2f67a82 to be more more DRY, but it was wrong in some cases: for instance, it meant your carrier was automatically set to 'deutsche_telekom' if you had an US SIM.

Also took the time to sort the 2 arrays by MCC.
`2  	Telefónica O2 Czech Republic a.s.	O2` as `telefonica`?
`3  	Vodafone Czech Republic a.s.	Vodafone` as `deutsche_telekom`?
`99  	Vodafone Czech Republic a.s. R&D Centre	Vodafone` as `deutsche_telekom`?
`10  	Telefónica O2 Czech Republic a.s.	O2` as `telefonica`?