Format errors for readability

[tristanlabelle]

Before:

ErrorResponse(status: WebDriver.ErrorResponse.Status(rawValue: 7), value: WebDriver.ErrorResponse.Value(error: Optional("no such element"), message: "An element could not be located on the page using the given search parameters.", stacktrace: nil))

After:

Error 7 (no such element): An element could not be located on the page using the given search parameters.