Launching FocalpointMultiCropper.app from Streamdeck opens a second instance of Electron (macOS)

[dotherightthing]

• How do you force an electron app to have a single instance?
• https://www.electronjs.org/docs/latest/api/app#apprequestsingleinstancelockadditionaldata

On macOS, the system enforces single instance automatically when users try to open a second instance of your app in Finder, and the open-file and open-url events will be emitted for that. However when users start your app in command line, the system's single instance mechanism will be bypassed, and you have to use this method to ensure single instance.