[Tile-serving] [openstreetmap/osm2pgsql] `way_area` in hstore instead of a separate column now? (Issue #1590)

[Sarah Hoffmann]

Turns out, this is a bug. Somehow we don't properly reset column flags when reading the style file.

Style file:
```
node,way   wetland                       text      polygon,nocolumn
way        foo                           text      linear
way        way_area                      real      
```
results in columns `foo`, `way_area`.

Style file:
```
node,way   wetland                       text      polygon,nocolumn
way        foo                           text      
way        way_area                      real      linear
```
results in column `way_area` only.

Style file:
```
node,way   wetland                       text      polygon
way        foo                           text
way        way_area                      real
```
results in columns `wetland`, `foo` and `way_area`.

This could go unnoticed for so long because most people modify the default style where all columns have flags.

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