Fix typo - is_deprecated was being set twice, skipping is_experimental.

core/object/script_language_extension.h

@@ -459,7 +459,7 @@ public:
 		r_result.description = ret.get("description", "");
 		r_result.is_deprecated = ret.get("is_deprecated", false);
 		r_result.deprecated_message = ret.get("deprecated_message", "");
-		r_result.is_deprecated = ret.get("is_deprecated", false);
+		r_result.is_experimental = ret.get("is_experimental", false);
 		r_result.experimental_message = ret.get("experimental_message", "");
 
 		r_result.doc_type = ret.get("doc_type", "");