Updates to TN3270 NSE Library

Hi All, 

Just submitted pull request 1218 https://github.com/nmap/nmap/pull/1218 <https://github.com/nmap/nmap/pull/1218> which fixes a 3 year old bug in the way the screens are being rendered. This was previous fixed with a quick fix. That broke the entire library and all scripts that required specific cursor placement. This pull request fixes that issue as well as fixing the screen rendering issue.

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