fix: set baseApiUrl rather than assign config.API_URL which is now a getter

[sandikbarr]

As mentioned in #390 setting the customMapboxApiUrl on the map component is throwing an error that it is unable to set property API_URL on config which is now a getter.

ngx-mapbox-gl.mjs:767 Uncaught TypeError: Cannot set property config of [object Module] which has only a getter
    at MapService.assign (ngx-mapbox-gl.mjs:767:1)
    at ngx-mapbox-gl.mjs:34:1
    at Object.next (Subscriber.js:123:1)
    at Subscriber._next (Subscriber.js:63:1)
    at Subscriber.next (Subscriber.js:34:1)
    at throwIfEmpty.js:10:1
    at OperatorSubscriber._this._next (OperatorSubscriber.js:11:1)
    at Subscriber.next (Subscriber.js:34:1)
    at take.js:12:1
    at OperatorSubscriber._this._next (OperatorSubscriber.js:11:1)

Mapbox provides a baseApiUrl option that can be set on mapboxgl, example:

mapboxgl.baseApiUrl = 'https://api.mapbox.com';

How to test:
Set the customMapboxApiUrl input on the map component using the default value for Mapbox Cloud, "https://api.mapbox.com" (I am using this with an alternate Mapbox url, but the error will be shown if the config.API_URL is assign when customMapboxApiUrl is set.)

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[sandikbarr]

@Wykks any thoughts on this fix?

[Wykks]

Hi!

Looks good to me! Sorry for the delay