initializeNullableTypes is not applied for parameterized inputs

[Djaler]

Issue Description

I have enabled initializeNullableTypes option in gradle plugin configuration. Everything works well except for ...ParameterizedInput classes.

Expected Result

Default null value generated for arguments in ParameterizedInput classes as well.

Actual Result

Default null value not generated for ParameterizedInput classes.

Your Environment and Setup

• graphql-java-codegen version: 5.9.0

[Djaler]

Looks like we need to add it to template just like here