fix: correct config chaining in withIntercomPushNotification (#383)

The exported plugin was passing the original `config` to both
`appDelegate` and `infoPlist` instead of the chained `newConfig`,
which meant each plugin received the unmodified config rather than
the result of the previous plugin in the chain.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Rosie-Kennelly-1

src/expo-plugins/withPushNotifications.ts

@@ -59,7 +59,7 @@ export const withIntercomPushNotification: ConfigPlugin<IntercomPluginProps> = (
   props
 ) => {
   let newConfig = config;
-  newConfig = appDelegate(config, props);
-  newConfig = infoPlist(config, props);
+  newConfig = appDelegate(newConfig, props);
+  newConfig = infoPlist(newConfig, props);
   return newConfig;
 };