Fixed Minsk (Belarus) location data.

1. UMMM (Minsk-1 Airport) name was changed to Minsk for the following
   reasons:
     a. Minsk-1 Airport is the only airport located directly in Minsk.
        Minsk National Airport (UMMS) is located in more than 40
        kilometers from Minsk.
     b. Minsk-1 Airport is currently not used for regular flights.
2. Fixed the name of the UMMS (Minsk National Airport).
3. Fixed cordinates of the UMMS (Minsk National Airport).

https://bugzilla.gnome.org/show_bug.cgi?id=731394