Move config file info log

Otherwise it outputs when trying to open a file in an existing instance
externally. Externally there isn't an environment variable to branch on
to skip this line so instead output it with the other info lines in the
child process.

src/node/entry.ts

@@ -188,6 +188,8 @@ const main = async (args: Args, configArgs: Args): Promise<void> => {
   })
 
   logger.info(`code-server ${version} ${commit}`)
+  logger.info(`Using config file ${humanPath(args.config)}`)
+
   const serverAddress = await httpServer.listen()
   logger.info(`HTTP server listening on ${serverAddress}`)