Use the document's real path when the VTE setting 'Follow the path of the current file' is used to prevent unnecessary directory changes when symlinks are used (reported by Dominic Hopf).

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3532 ea778897-0a13-0410-b9d1-a72fbfd435f5