DEV: Allow transformed values to be used in all widget hbs statements (#13331)

Previously, the `transformed.blah` shortcut could only be used in top-level hbs statements like {{transformed.blah}}. When attempting to use it in a sub-expression like `{{concat "hello" transformed.world}}`, it would raise a "transformed is not defined" error.

This commit updates the shortcut logic to make `transformed.blah` and `attrs.blah` work consistently in all hbs expressions.

Co-authored-by: Jordan Vidrine <jordan@jordanvidrine.com>

lib/javascripts/widget-hbs-compiler.js

@@ -16,7 +16,7 @@ function sexpValue(value) {
   } else if (value.type === "SubExpression") {
     return sexp(value);
   }
-  return pValue;
+  return resolve(pValue);
 }
 
 function pairsToObj(pairs) {