Remove the nullable transformation for the config schema.

crates/config/src/bin/schema.rs

@@ -4,15 +4,10 @@
 // SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 // Please see LICENSE files in the repository root for full details.
 
-use schemars::{
-    generate::SchemaSettings,
-    transform::{AddNullable, RecursiveTransform},
-};
+use schemars::generate::SchemaSettings;
 
 fn main() {
-    let generator = SchemaSettings::draft07()
-        .with_transform(RecursiveTransform(AddNullable::default()))
-        .into_generator();
+    let generator = SchemaSettings::draft07().into_generator();
     let schema = generator.into_root_schema_for::<mas_config::RootConfig>();
 
     serde_json::to_writer_pretty(std::io::stdout(), &schema).expect("Failed to serialize schema");