desktop: Adjust to wlr_xcursor_manager_load 0.11.0 API change
As of wlroots 0.11.0 (666498db015ad1439a8916bce609baf8fa042b5d) The function now returns a bool instead of an int with an inverted logic.
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As of wlroots 0.11.0 (666498db015ad1439a8916bce609baf8fa042b5d) The function now returns a bool instead of an int with an inverted logic.