Bug 1573725 followup: update devtools css db to reflect that `text-decoration-thickness: from-font` is supported. r=dholbert

DONTBUILD because this will still fail xpcshell tests
until the next commit which adds `from-font` to the other
new property, `text-underline-offset`.

Differential Revision: https://phabricator.services.mozilla.com/D42005

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

devtools/shared/css/generated/properties-db.js

@@ -10012,6 +10012,7 @@ exports.CSS_PROPERTIES = {
     "supports": [],
     "values": [
       "auto",
+      "from-font",
       "inherit",
       "initial",
       "revert",