Update config.ts sauceSeleniumAddress comment to reflect 443 default

[enriquegh]

Per the default behavior set in:
https://github.com/angular/protractor/blob/master/lib/driverProviders/sauce.ts#L68-L70

the Sauce OnDemand address will default to ondemand.saucelabs.com:443 unless changed.
The config.ts doc says the default is ondemand.saucelabs.com:80.

This PR simply changes the port number on the config.ts comment.

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[enriquegh]

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