qt_common: consistently ifdef QPlatform after cbd79df23375

src/yuzu/qt_common.cpp:45:33: error: member access into incomplete type 'QPlatformNativeInterface'
    wsi.display_connection = pni->nativeResourceForWindow("display", window);
                                ^
/usr/include/qt6/QtGui/qguiapplication.h:20:7: note: forward declaration of 'QPlatformNativeInterface'
class QPlatformNativeInterface;
      ^
src/yuzu/qt_common.cpp:47:42: error: member access into incomplete type 'QPlatformNativeInterface'
        wsi.render_surface = window ? pni->nativeResourceForWindow("surface", window) : nullptr;
                                         ^
/usr/include/qt6/QtGui/qguiapplication.h:20:7: note: forward declaration of 'QPlatformNativeInterface'
class QPlatformNativeInterface;
      ^

src/yuzu/qt_common.cpp

@@ -8,7 +8,7 @@
 #include "core/frontend/emu_window.h"
 #include "yuzu/qt_common.h"
 
-#ifdef __linux__
+#if !defined(WIN32) && !defined(__APPLE__)
 #include <qpa/qplatformnativeinterface.h>
 #endif