Disable --experimental-debugger by default (#40795)

Summary:

Changelog: [Internal]

Reviewed By: hoxyq

Differential Revision: D50178494

packages/community-cli-plugin/src/commands/start/index.js

@@ -96,14 +96,11 @@ const startCommand: Command = {
       description: 'Disables interactive mode',
     },
     {
-      name: '--experimental-debugger [bool]',
+      name: '--experimental-debugger',
       description:
         "[Experimental] Enable the new debugger experience and 'j' to " +
         'debug. This enables the new frontend experience only: connection ' +
         'reliability and some basic features are unstable in this release.',
-      parse: (val: ?string): boolean =>
-        val !== undefined && val !== 'false' && val !== '0',
-      default: true,
     },
   ],
 };