Fix watch-server script on macOS

[MrMYHuang]

The script

cross-env NODE_ENV=development nodemon --watch src/**/* -e ts,tsx --exec ts-node src/server/server.ts

is expanded to

cross-env NODE_ENV=development nodemon --watch src/server/config.ts src/server/config.ts src/server/logging.ts src/server/routes.ts src/server/server.ts -e ts,tsx --exec ts-node src/server/server.ts

on macOS. Changing to --watch src/**/ fixes the problem.