Fixing -P option being ignored

[r3nt0n]

Seems that smbmap ignores the custom port passed via -P, still tries to connect to 445/tcp. This PR should fix it. I didn't test all functionalities, just basic use cases: connect and enumerate all shares content recursively.

Bear in mind that this is more a quick dirty patch than a long-term solution. There is probably a better way to do it than using a global variable, but I didn't have time to mess with the map calls.

Also, there are two reasons to explain the changes in line 1233:

• host['ip'] instead of host['host'] because it was throwing a missing key exception regarding 'host'
• This line was also causing a connection error because it was trying to connect to NetBIOS port. Since one of the most common scenarios to provide a custom port would be when you are connecting to the target via some pivot point (e.g. port forwarding on an intermediate host), this wouldn't be always possible. So I dipped my toe into impacket SmbConnection class and seems that the change from '*SMBSERVER' to 'host['ip'] was the way to avoid this behavior.
• This change renders the if-else there redundant, I just keep it in case is needed for other features that I didn't test. If not, it can be removed.

Anyway, still feels hacky and probably need some improvements, but at least it works :)