Bug 1585637 - Turn on layout.css.width-and-height-map-to-aspect-ratio.enabled on late beta and release. r=dholbert

Differential Revision: https://phabricator.services.mozilla.com/D47902

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.yaml

@@ -5266,7 +5266,7 @@
 # internal-for-now aspect-ratio property?
 - name: layout.css.width-and-height-map-to-aspect-ratio.enabled
   type: bool
-  value: @IS_EARLY_BETA_OR_EARLIER@
+  value: true
   mirror: always
 
 # The fraction of the scrollport we allow to horizontally scroll by before we