fix: use schema from zod-utils (#225)

fixes:- https://secure.helpscout.net/conversation/2117165409/2395

How to test? 
Create an event type with custom inputs 
GET Request on /event-types end point


After:- 
<img width="1440" alt="Screenshot 2023-01-07 at 4 57 39 PM"
src="https://user-images.githubusercontent.com/53316345/211147930-1154f1ad-5309-4e9c-b2e0-164169717d47.png">

Signed-off-by: Udit Takkar <udit.07814802719@cse.mait.ac.in>

lib/validations/event-type.ts

@@ -1,6 +1,7 @@
 import { z } from "zod";
 
-import { _EventTypeCustomInputModel, _EventTypeModel as EventType } from "@calcom/prisma/zod";
+import { _EventTypeModel as EventType } from "@calcom/prisma/zod";
+import { customInputSchema } from "@calcom/prisma/zod-utils";
 
 import { Frequency } from "~/lib/types";
 
@@ -122,6 +123,6 @@ export const schemaEventTypeReadPublic = EventType.pick({
       )
       .nullable(),
     metadata: jsonSchema.nullable(),
-    customInputs: _EventTypeCustomInputModel.array().optional(),
+    customInputs: customInputSchema.array().optional(),
   })
 );