rm braces from findNestedSchema (#2970)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- Refactor
- Simplified internal logic for deep validation checks, reducing
verbosity while preserving existing behavior, error handling, and
override logic. This improves readability and maintainability without
changing outcomes or performance characteristics.

- No User-Facing Changes
  - No impact on APIs, configuration, or outputs. No migration required.

- Tests
  - Existing behavior remains consistent; no test changes required.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: RobinTail

express-zod-api/src/deep-checks.ts

@@ -21,16 +21,14 @@ export const findNestedSchema = (
   { io, condition }: NestedSchemaLookupProps,
 ) =>
   R.tryCatch(
-    () => {
-      z.toJSONSchema(subject, {
+    () =>
+      void z.toJSONSchema(subject, {
         io,
         unrepresentable: "any",
         override: ({ zodSchema }) => {
           if (condition(zodSchema)) throw new DeepCheckError(zodSchema); // exits early
         },
-      });
-      return undefined;
-    },
+      }),
     (err: DeepCheckError) => err.cause,
   )();