update WinSCP to 5.5.4

git-svn-id: http://svn.miranda-ng.org/main/trunk@9431 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
fix for crash in clist_nicer on startup

git-svn-id: http://svn.miranda-ng.org/main/trunk@9432 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c