Fix proposal for #929

[nicolasfranck]

Description of what you did:

• This is a fix proposal for thumbnails not reloaded after login #929 were I introduce a cache key in the content-left-panel that is only changed after a login event. This should be added to the thumbnail uri. Not sure if this works with all urls as I merely append ?t=<timestamp> to the thumbnail uri, and I know that some people use query parameters in their iiif image api url's (because directly passed to an iipsrv). e.g. https://myhost/?IIIF=?t=timestamp

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[demiankatz]

Thanks, @nicolasfranck! I think the questions we now need to answer (which might require input from others) are whether there are other situations where we should invalidate the cache, and whether this replaces the existing config setting, or if it should perhaps be incorporated with it (e.g. if the thumbnail cache invalidation setting is disabled, should that prevent us from adding the extra parameter to thumbs?).