Bug 1645706 [Wayland] disable dmabuf-video-textures by default, r=jhorak

Differential Revision: https://phabricator.services.mozilla.com/D79624

modules/libpref/init/StaticPrefList.yaml

@@ -9607,7 +9607,7 @@
 # Use DMABuf for video textures.
 - name: widget.wayland-dmabuf-video-textures.enabled
   type: RelaxedAtomicBool
-  value: true
+  value: false
   mirror: always
 
 # Use smooth rendering for basic compositor.