Bug 1666086 - Enable layout.css.moz-any-is-is.enabled on all channels. r=jwatt

We haven't heard of any issues with this during the 81 and 82 cycles,
and I think we should try to do this.

This should land after the 82 merge.

Differential Revision: https://phabricator.services.mozilla.com/D90789

modules/libpref/init/StaticPrefList.yaml

@@ -5806,7 +5806,7 @@
 # Whether :-moz-any is an alias of the :is selector.
 - name: layout.css.moz-any-is-is.enabled
   type: RelaxedAtomicBool
-  value: @IS_EARLY_BETA_OR_EARLIER@
+  value: true
   mirror: always
   rust: true