Update electron single instance API #7481
Description
Electron sez:
'app.makeSingleInstance(cb)' is deprecated. Use 'app.requestSingleInstanceLock() and app.on('second-instance', cb)' instead.
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Electron sez:
'app.makeSingleInstance(cb)' is deprecated. Use 'app.requestSingleInstanceLock() and app.on('second-instance', cb)' instead.