remove unused patch file

packages/wallpaper-engine-kde-plugin/qt6-mpv-backend.patch

@@ -1,41 +0,0 @@
-diff --git a/src/backend_mpv/MpvBackend.cpp b/src/backend_mpv/MpvBackend.cpp
-index 1234567..abcdefg 100644
---- a/src/backend_mpv/MpvBackend.cpp
-+++ b/src/backend_mpv/MpvBackend.cpp
-@@ -36,7 +36,9 @@
- #    include <QX11Info> // IWYU pragma: keep
- #endif
- //#endif
-+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
- #    include <qpa/qplatformnativeinterface.h> // IWYU pragma: keep
-+#endif
- #endif
- 
- Q_LOGGING_CATEGORY(wekdeMpv, "wekde.mpv")
-@@ -81,19 +83,24 @@ int create_gl(MPVCLientAPI* mpv, mpv_render_context** mpv_gl, mpv_opengl_init_p
- #if defined(__linux__) || defined(__FreeBSD__)
-     if (QGuiApplication::platformName().contains("xcb")) {
-         params[2].type = MPV_RENDER_PARAM_X11_DISPLAY;
- #if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
--        // TODO: QGuiApplication::nativeInterface<QNativeInterface::QX11Application>()::display();
--        // same for wayland
--        auto* native   = QGuiApplication::platformNativeInterface();
--        params[2].data = native->nativeResourceForWindow("display", nullptr);
-+        auto* x11App = qApp->nativeInterface<QNativeInterface::QX11Application>();
-+        params[2].data = x11App ? x11App->display() : nullptr;
- #else
-         params[2].data = QX11Info::display();
- #endif
-     }
-     if (QGuiApplication::platformName().contains("wayland")) {
-         params[2].type = MPV_RENDER_PARAM_WL_DISPLAY;
-+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
-+        auto* waylandApp = qApp->nativeInterface<QNativeInterface::QWaylandApplication>();
-+        params[2].data = waylandApp ? waylandApp->display() : nullptr;
-+#else
-         auto* native   = QGuiApplication::platformNativeInterface();
-         params[2].data = native->nativeResourceForWindow("display", nullptr);
-+#endif
-     }
- #endif
-     int code = mpv_render_context_create(mpv_gl, mpv, params);