add path: to /collection_id for /map

[C-Loftus]

Overview

Most flask endpoints in pygeoapi use <path:collection_id> to allow for nested collection names like my_map/elevation vs my_map/land_use.

For instance
@BLUEPRINT.route('/collections/<path:collection_id>/position')

However for /map this didn't appear to be present

As such, if you change the default WMS provider to have a / then it will break, for instance like this.

    mapserver_world_map/test:
        type: collection
        title: MapServer demo WMS world map
        description: MapServer demo WMS world map

However, if I add the path fix then it will load fine and allow collection names with /

I have changed this to add the path since I presume this was missing unless I am missing something about the internal workings of the WMS provider.

Related Issue / discussion

Discussed offline with @webb-ben

Additional information

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines