Match isProduction definitions

Summary:
Match isProduction definition in flipper-common and flipper-server/src/index.tsx.

Without it, PWA never quits after all clients disconnect because Flipper Launcher does not set NODE_ENV to production currently (changed in the next diff)

Reviewed By: LukeDefeo, lblasa

Differential Revision: D48265768

fbshipit-source-id: 59e4660cb57da20b606562144c47c65276999d6c

desktop/flipper-common/src/utils/isProduction.tsx

@@ -13,6 +13,7 @@ declare const process: any;
 // this one, and one provided by the RenderHostConfig. Ideally they should be unified
 export function isProduction(): boolean {
   return (
-    typeof process === 'undefined' || process.env.NODE_ENV === 'production'
+    typeof process === 'undefined' ||
+    (process.env.NODE_ENV !== 'development' && process.env.NODE_ENV !== 'test')
   );
 }