Fix start up crash

Potentially be this issue https://forums.expo.io/t/expo-sentry-crashes-on-startup-except-the-first-time/47761

src/startup/sentry.ts

@@ -5,7 +5,6 @@ import log from './log'
 const sentry = () => {
   log('log', 'Sentry', 'initializing')
   return Sentry.init({
-    environment: Constants.manifest.releaseChannel || 'expo',
     dsn: Constants.manifest.extra.sentryDSN,
     enableInExpoDevelopment: false,
     debug: __DEV__