fix: adjust discriminatedUnion to match function signature

Author: TheyCodeMeSilvers

packages/zod/src/to-string.ts

@@ -143,7 +143,7 @@ export function toString(schema: z.ZodType | z.core.$ZodType, options?: toString
       case tagged('intersection')(x): return `${z}.intersection(${x._zod.def.left}, ${x._zod.def.right})`
       case tagged('union')(x): return x._zod.def.discriminator === undefined
         ? `${z}.union([${x._zod.def.options.join(',')}])`
-        : `${z}.discriminatedUnion(["${escape(x._zod.def.discriminator)}", ${x._zod.def.options.join(',')}])`
+        : `${z}.discriminatedUnion("${escape(x._zod.def.discriminator)}",[${x._zod.def.options.join(',')}])`
       case tagged('lazy')(x): return `${z}.lazy(() => ${x._zod.def.getter()})`
       case tagged('pipe')(x): return `${x._zod.def.in}.pipe(${x._zod.def.out})`
       case tagged('default')(x): return `${x._zod.def.innerType}.default(${serializeShort(x._zod.def.defaultValue!)})`