[Tile-serving] [osm2pgsql-dev/osm2pgsql] highway=osm_restarea treatet as line (Issue #2116)

[reald]

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## What version of osm2pgsql are you using?

```
osm2pgsql version 1.10.0
Build: RelWithDebInfo
Compiled using the following library versions:
Libosmium 2.20.0
Proj [API 6] 8.2.1
Lua 5.3.6
```

## What operating system and PostgreSQL/PostGIS version are you using?

Ubuntu 22.04.3 LTS

## Tell us something about your system

32GB Ram, 16 Cores


## What did you do exactly?

Imported .pbf file:

 `osm2pgsql --slim --drop -C 8192 -c -S default.style -l -d $DBNAME -U real -H localhost -W germany-latest.osm.pbf`



## What did you expect to happen?

Closed lines with `highway='rest_area'` should appear in `planet_osm_polygon`.


## What did happen instead?

Closed lines with `highway='rest_area'` appeared in `planet_osm_line` and some in `planet_osm_polygon`.

## What did you do to try analyzing the problem?

Tried osm2pgsql version 1.6 and 1.10.0.

The difference seem to be that the entries in `planet_osm_polygon` have `area='yes'` set, too.

The problem is that setting `area='yes'` is unnecessary because `highway='rest_area'` already implicitly marks an area. josm gives a warning if you want wo set `area='yes'` together with `highway='rest_area'`.

=> Treat all closed lines with `highway='rest_area'` as areas independent if `area='yes'` is set or not.



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