renderMap being called multiple times. Need to use once.

To ensure that renderMap() is only called once per mapbox_renderer settings instance I have introduced a requirement where an id property must be set on the settings object.

E.g. mapbox_renderer[0].id

This id matches the id of the field wrapper.

This allows targeting that element using once, to ensure settings are only bound once.

As a result of this MapboxFormatter from the mapbox_field module will also need to be updated.

I'm working on patching a number of issues in that module so will include that update there.

I see, the ID was already there as the key, but it's just mapbox_field was not setting the key.

Updated the patch to use the ID from the settings key.