Opening plugin instruments from instrument box suggestion

Double clicking VST instrument from instrument box should always open VST gui. Currently it opens only instrument editor, if Pin to Renoise window is disabled.

IMO it would be much better behavior to open ONLY the VST gui and not the instrument editor window at all, if pin to rns window is disabled. You rarely need to play with instrument settings working with plugin instruments, but you need to fiddle with the instrument gui a lot.