Breaking electron-main.js file generation due to additional brackets

[rodat-dev]

This is causing an issue on the src-gen for the electron version of Theia.

The fix is simple

From:

require('fix-path')()

To:

require('fix-path')

Tested locally only, to make sure it works properly.

Currently it breaks when it attempts to start the electron app, so it's quite a useful fix.