[FR] Surroundpanner should not close

Since same plugins still do not open in the same window, I have to use the close all plugin windows-command quite often.

But this also closes the surroundpanner, which I always want to have opened, in my understanding it is not a plugin, but a part of the mixer. And I never have too many surroundpanners opened, since this tool fortunately can be locked.

So I always have to re-open surroundpanner, and then relock this one.
Too many clicks, just to keep the GUI clean…