fix: allow false for custom field 'fieldRequired' by using z.boolean() (calcom#25322)

* fix: allow false for custom field 'fieldRequired' by using z.boolean()

* updated to z.boolean().optional()

---------

Co-authored-by: Pallav <90088723+Pallava-Joshi@users.noreply.github.com>

Author: kartik-212004

apps/api/v2/src/ee/event-types/event-types_2024_06_14/transformers/internal-to-api/booking-fields.ts

@@ -318,7 +318,7 @@ const CustomFieldsSchema = z.object({
       id: z.literal("user"),
       type: z.literal("user"),
       label: z.literal("User"),
-      fieldRequired: z.literal(true),
+      fieldRequired: z.boolean().optional(),
     })
   ),
   editable: z.enum(["user", "user-readonly"]),