electron: 1.8.1 -> 1.7.9
electron: 1.8.1 -> 1.7.9

1.7.9 is the latest stable, and 1.8.1 is beta and it draws `rambox` as a white
rectangle (after a few manipulations with the window such as hiding, showing,
resizing): https://github.com/NixOS/nixpkgs/pull/32741#issuecomment-352203170

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