Description of change

• fix: revert electron-builder version used in Electron template

There's an issue with Electron Builder >=25.0.1 where building an app produces an asar archive with a node_modules tree that uses wrong module versions, which causes the packaged app to behave differently than it does on dev mode, and very frequently crash or not load at all.
I'm downgrading the version of electron-builder used in the template electron app until this is fixed.

Pull-Request Checklist

• Code is up-to-date with the master branch
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• This pull request links relevant issues as Fixes #0000
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