Fix masterportalapi defaults

[warm-coolguy]

Summary

Somehow the default marker design from the masterportalAPI doesn't work at the moment. However, our docs say that we use the OL default anyway:

polar/src/core/types/layer.ts

Lines 121 to 127 in 22fd554

	/**
	* ID of the used style. If the layer is also configured in {@link MapConfiguration.markers | `mapConfiguration.markers`},
	* that configuration takes precedence over the configured `styleId`. Only applicable for vector-type layers.
	* For more information and an example see {@link MapConfiguration.featureStyles | `mapConfiguration.featureStyles`}.
	* Defaults and fallbacks to OpenLayers default styling.
	*/
	styleId?: string

Hence, the OL default is now used, and markers will only appear if we configure them to.

Instructions for local reproduction and review

Remove markers entry in snowbox. Patch is in issue if you prefer that route. Run snowbox, receive styles.

Pull Request Checklist (for Assignee)

• Functionality has been tested in Chrome

Relevant tickets, issues, et cetera

Resolves #959

[github-actions]

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