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Avoid calling dealloc_crtc() when destroying a DRM backend.

manuel alfayate requested to merge vanfanel/wlroots:fix_backend_destroy_modesetting into master

As things are, a modesetting is done at quit even if the original KMS mode is being used, causing massive blinking on digital displays. This PR avoids that unneeded modesetting by avoiding the call to dealloc_crtc() in drm_connector_destroy_output(), but only when a backend destruction is being made.

Fixes #3497 (closed)

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