PHP-1158: Don't log connectTimeoutMS replacement when changing default

https://jira.mongodb.org/browse/PHP-1158
I don't see why you moved this here. It's not really incorrect, but it makes it harder to understand what happens. We should only set the new value if they're not the same... but that's no longer what the code does. Now it only changes it if its different than the *default*, and it wouldn't warn when you have the option twice - in the connect string, and then later in the options array — or when you use both timeout, and connectTimeoutMS.