VBK: Use the shapefile as source for offshore projects.

The file appears to be official and updated as often as the GPKG
nowdays.  Both have 101 distinct features.

And unlike the GPKG the multipolygons are not split, so we add the
UNIQUE CONSTRAINT on "OmrID".

For some reason there are a lot of duplicates in the GPKG.

    sqlite> SELECT "ObjectID", COUNT(*) FROM "lst_vbk_havsbaserad_vindkraft" GROUP BY 1 ORDER BY 2;
    101|9
    1|24
    2|24
    […]
    100|24

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