Always use native Wayland backend on KDE Plasma. (#2131)

This will fix issues with broken hotkeys with KDE Plasma on Wayland.

Partially reverts 5d66405ed0e0fb871c174b8c1dfffb4a4d48034e commit.

Signed-off-by: Vitaly Zaitsev <vitaly@easycoding.org>

src/main.cpp

@@ -50,8 +50,7 @@ void wayland_hacks()
 {
     // Workaround to https://github.com/ksnip/ksnip/issues/416
     DesktopInfo info;
-    if ((info.windowManager() == DesktopInfo::GNOME) ||
-        (info.windowManager() == DesktopInfo::KDE)) {
+    if (info.windowManager() == DesktopInfo::GNOME) {
         qputenv("QT_QPA_PLATFORM", "xcb");
     }
 }