ENH: improve UX of tab display between datasets

[jsheunis]

The way that a selected tab currently remains the displayed tab before and after navigating to a subdataset feels unintuitive. Previously, the "subdatasets" tabs was always the default displayed tab upon navigation to a dataset page. This was changed to keep the last displayed tab as the active one after navigation. But this was particularly in the case when a subdataset was navigated to from the file tree view. It is currently always done, so maybe a more granular approach is necessary? or just revert to the original approach?

[jsheunis]

Reverting to original. this also circumvents the issue related to back button navigation: #271. This issue can be closed once the change is merged, but IMO the navigation setup requires more detailed UX testing in order to settle on a setup for the future.