#221 GTK: Close settings after "Hide VDC" only when needed.

[Greg King]

This patch will close the Settings dialog, after hiding the VDC display, only if "Settings" was opened from the VDC window.

[compyx]

I personally didn't want to add that to ui.c, but yes, that'll work.

[compyx]

Applied in r37534

Did I really get the indentation wrong of gtk_widget_show()?