fix: respect redirect on preview disable

src/runtime/server/routes/preview/disable.ts

@@ -1,6 +1,7 @@
-import { defineEventHandler, deleteCookie, sendRedirect } from 'h3'
+import { defineEventHandler, deleteCookie, getQuery, sendRedirect } from 'h3'
 
 export default defineEventHandler(async event => {
+  const { redirect } = getQuery(event)
   deleteCookie(event, '__sanity_preview')
-  await sendRedirect(event, '/')
+  await sendRedirect(event, redirect?.toString() || '/')
 })