chore(example): fix sourcemap being completely wrong

This is only a workaround found on the expo issue
expo/expo#24273 (comment)

Author: Pierre Poupin

packages/example/package.json

@@ -4,9 +4,9 @@
   "main": "index.js",
   "scripts": {
     "start": "expo start",
-    "android": "EXPO_TV=1 expo run:android",
-    "ios": "EXPO_TV=1 expo run:ios",
-    "web": "expo start --web",
+    "android": "EXPO_NO_CLIENT_ENV_VARS=1 EXPO_TV=1 expo run:android",
+    "ios": "EXPO_NO_CLIENT_ENV_VARS=1 EXPO_TV=1 expo run:ios",
+    "web": "EXPO_NO_CLIENT_ENV_VARS=1 expo start --web",
     "build:web": "expo export -p web",
     "prebuild": "EXPO_TV=1 expo prebuild --clean"
   },