Non-public datasets accessed using a token do not honor default settings

[daniel-wer]

This issue is about accessing non-public datasets using the Sharing Link with a token, when logged out.
Under these circumstances the /api/dataSetConfigurations/<dataset_name> request does not return the configured default position and zoomstep, which is why the dataset doesn't open at the correct position in the tracing view.

Steps to reproduce:

• Configure a default position for a non-public dataset
• Copy the Sharing Link for that dataset (should include a token, because the dataset is not public)
• Log out and access the dataset using the copied link
• You will not be at the configured default position, but instead at the center of the bounding box

[daniel-wer]

There's some to be a regression and this is broken again. I've configured a default position and default layer settings for a dataset, but when accessed through a sharing link while being logged out, the default configuration is not returned by the server. See the initial issue description for instructions to reproduce.