[1/2] fix No input in nested session

fix erroneous libinput use:
https://bugs.kde.org/show_bug.cgi?id=421486

startkde/startplasma-wayland.cpp

@@ -90,7 +90,7 @@ int main(int argc, char** argv)
             args << QString::fromLocal8Bit(argv[i]);
         }
     } else {
-        args = QStringList { QStringLiteral("--xwayland"), QStringLiteral("--libinput"), QStringLiteral("--exit-with-session=" CMAKE_INSTALL_FULL_LIBEXECDIR "/startplasma-waylandsession") };
+        args = QStringList { QStringLiteral("--xwayland"), QStringLiteral("--exit-with-session=" CMAKE_INSTALL_FULL_LIBEXECDIR "/startplasma-waylandsession") };
     }
     runSync(QStringLiteral(KWIN_WAYLAND_BIN_PATH), args);