Fix SiteSecurityRobot.kt after the 149 rebase

When building in tor-browser-build, I found this error:

file:///var/tmp/build/geckoview-b38edff6db8e/mobile/android/fenix/app/src/androidTest/java/org/mozilla/fenix/ui/robots/SiteSecurityRobot.kt:246:24: error: Unresolved reference 'trackingProtectionSwitch'

I commented enhancedTrackingProtectionSwitch everywhere, and it seemed to work, but I wonder if we want to so something better than this.