Make dev client default when starting expo-example (#3615)

## Description

Currently when we start `expo-example` it uses expo go by default. This
PR changes it do use `dev client` instead

## Test plan

Run `expo-example`

Author: m-bert

apps/expo-example/package.json

@@ -4,7 +4,7 @@
   "main": "index.ts",
   "scripts": {
     "postinstall": "npx expo prebuild",
-    "start": "expo start",
+    "start": "expo start --dev-client",
     "android": "expo run:android",
     "ios": "expo run:ios",
     "web": "expo start --web",