As reported in #3971, some URLs like 
https://www.openstreetmap.org/?mlat=53.32607&mlon=-1.49033 reset the 
currently selected layers. In order to restore the previous setting, a user 
needs to select both map and overlay layers after click on the link. 

It seems a bit premature to simply override the current layers, in case the 
link does not include any layer information.

Instead, this PR unconditionally extracts the current layers from the 
_osm_location cookie, so it can be applied consistently across different url 
parsing alterantives.

As before, if the link includes layers in the hash value, that information 
takes precedence.

This change mainly impacts line 144 below:

```
mapParams.layers = hash.layers || (loc && loc[3]) || '';
```

loc[3] will now always contain  the selected layers, as long as the cookie is 
available.





You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5529

-- Commit Summary --

  * Consistent usage of layer information in _osm_location cookie

-- File Changes --

    M app/assets/javascripts/osm.js.erb (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5529.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5529.diff

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