Do not add chromeOptions to IE capabilities

[andrejsstepanovs]

First of all - Thank You for this repo. It is working like a charm and saved my day!

About this PR:

It is not possible to start up IE browser (in browserstack) with current configuration. It complains about chromeOptions key in capabilities.

      Behat\Mink\Exception\DriverException: Could not open connection: Invalid option: chromeOptions for browser: ie in vendor/silverstripe/mink-facebook-web-driver/src/FacebookWebDriver.php:375
      Stack trace:
      #0 vendor/friends-of-behat/mink/src/Session.php(70): SilverStripe\MinkFacebookWebDriver\FacebookWebDriver->start()
      #1 vendor/friends-of-behat/mink/src/Session.php(145): Behat\Mink\Session->start()
      #2 vendor/friends-of-behat/mink-extension/src/Behat/MinkExtension/Context/RawMinkContext.php(131): Behat\Mink\Session->visit()
      #3 vendor/friends-of-behat/mink-extension/src/Behat/MinkExtension/Context/MinkContext.php(49): Behat\MinkExtension\Context\RawMinkContext->visitPath()

Solution:

Just if statement.
First I checked if browser is chrome but then decided to do other way around and just exclude IE for these params because looks like all other browsers (ff, safari, edge) have no problem with this.