* Revert 79d164309f
as it seems to break shortcuts altogether
* Update electron-builder (and add the squirrel windows package
that the newer version now requires: it's been split out). This
uses a newer version of squirrel which has some fixes for
shortcuts.
I'm unsure exactly what was going wrong originally in
https://github.com/vector-im/riot-web/issues/2775 but #79d1643
seems to break shortcut creation as far as I can see.