DefaultDialogWindow: Avoid bad positioning on Linux

This change avoids a situation where a standalone plugin's Audio/Midi
settings window could appear in a wrong position.

modules/juce_gui_basics/windows/juce_DialogWindow.cpp

@@ -83,9 +83,6 @@ public:
                             ? Component::getApproximateScaleFactorForComponent (options.componentToCentreAround)
                             : 1.0f)
     {
-        setUsingNativeTitleBar (options.useNativeTitleBar);
-        setAlwaysOnTop (juce_areThereAnyAlwaysOnTopWindows());
-
         if (options.content.willDeleteObject())
             setContentOwned (options.content.release(), true);
         else
@@ -93,6 +90,9 @@ public:
 
         centreAroundComponent (options.componentToCentreAround, getWidth(), getHeight());
         setResizable (options.resizable, options.useBottomRightCornerResizer);
+
+        setUsingNativeTitleBar (options.useNativeTitleBar);
+        setAlwaysOnTop (juce_areThereAnyAlwaysOnTopWindows());
     }
 
     void closeButtonPressed() override