Bug 1613360 - Enable form.requestSubmit by default; r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D61679

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

modules/libpref/init/StaticPrefList.yaml

@@ -1573,10 +1573,10 @@
   value: false
   mirror: always
 
-# Whether the form.requestSubmit API is enabled
+# Enable the form.requestSubmit API
 - name: dom.forms.requestsubmit.enabled
   type: bool
-  value: @IS_NIGHTLY_BUILD@
+  value: true
   mirror: always
 
 # Whether the Gamepad API is enabled