[search] Bigger plots screw-up search page

Example:

https://www.beat-eu.org/platform/search/?query=type:results%20tc:tutorial/eigenface_with_preprocessing/1%20db:atnt/1.idiap%20analyzer:tutorial/postperf_iso/1

And then, enable a "roc" plot. This is related to the fixes on the merge request !69 (merged).