Bug 1761402 - Let session change handling of window occlusion on Windows ride the trains to release r=jrmuizel,gfx-reviewers

Since Bug 1732739, "session change handling of window occlusion on Windows" is enabled until early beta. And no regression was reported. Then it seems OK to enable it until release.

Differential Revision: https://phabricator.services.mozilla.com/D145193

modules/libpref/init/StaticPrefList.yaml

@@ -13637,7 +13637,7 @@
 
 - name: widget.windows.window_occlusion_tracking_session_lock.enabled
   type: bool
-  value: @IS_EARLY_BETA_OR_EARLIER@
+  value: true
   mirror: always
 
 - name: widget.windows.hide_cursor_when_typing