Like adb, read the ANDROID_SERIAL environment variable to select a device by serial if no explicit selection (-s, -d, -e or --tcpip=<addr>) is provided via the command line. Fixes #3111 <https://github.com/Genymobile/scrcpy/issues/3111> PR #3113 <https://github.com/Genymobile/scrcpy/pull/3113>