Fix X11 error when showing VST3 on linux

Signed-off-by: falkTX <falktx@falktx.com>

source/utils/JucePluginWindow.hpp

@@ -65,7 +65,9 @@ public:
         if (! isOnDesktop())
             addToDesktop();
 
+#ifndef CARLA_OS_LINUX
         setAlwaysOnTop(true);
+#endif
         setTransient();
         setVisible(true);
         toFront(true);