Bug 1675547. Force layerization for all scrollframes that want it, when WR and fission is enabled. r=botond

We want this for hit testing purposes.

Depends on D103859

Differential Revision: https://phabricator.services.mozilla.com/D103860

modules/libpref/init/StaticPrefList.yaml

@@ -250,7 +250,7 @@
 
 - name: apz.wr.activate_all_scroll_frames_when_fission
   type: RelaxedAtomicBool
-  value: false
+  value: true
   mirror: always
 
 - name: apz.nonwr.activate_all_scroll_frames