Revert "opendingux: GCW0: defconfig: Enable QtCore, QtXml, and buteo-mtp"

The MTP stack does not work as expected on Windows computers.
It's better to leave it out of the rootfs for now, and
reintroduce it when it will work correctly.

This reverts commit 62a88c13c7ee31e9a848a0403338e8df703af65b.