[wayland] Ensure to not call into x11 on Compositor tear-down
During Compositor tear down Xwayland is already destroyed. Thus it doesn't make sense to try to delete the support properties: either it freezes in xcb or it crashes because the connection is null. At the same time we also ensure that the connection internally is reset to null. Note: the one in kwinglobals.h caches and could cause use-after-free errors. Any tear-down code must be migrated to kwinApp()->x11Connection().master
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