corrected italian regions/provinces

Regions: 2 changes:
  - 'Monza e Brianza' is really called: 'Monza e della Brianza'
  - 'Macerata' had wrong key 'IT-SC' -> corrected to 'IT-MC'

I have removed all regions which should not at all be in this list.

In Italy, regions do exist, but they are never used in addresses and they should not be listed in "states".

I noticed they had a different numeric key so probably you know this but anyways
nobody in italy uses them (only as a pre-selection so to narrow down the list of available provinces in a region).