LibJS: Set length property in Object::put_native_function()

Author: https://github.com/linusg
Commit: cd3e2690eb
Pull-request: https://github.com/SerenityOS/serenity/pull/1622
Reviewed-by: https://github.com/awesomekling ✅

Libraries/LibJS/Runtime/MathObject.cpp

@@ -34,7 +34,7 @@ namespace JS {
 
 MathObject::MathObject()
 {
-    put_native_function("abs", abs);
+    put_native_function("abs", abs, 1);
     put_native_function("random", random);
 
     put("E", Value(M_E));