fix for tightvnc (CCCP-82060)

"Whenever vncserver is running, easy-creds will now start in several screens (within vncviewer).. this has the advantage that you can use it almost like on the PC.. works very good. however, if you'd like to use it in terminal emulator, be sure to kill all vncservers before (vncserver -kill :2, for example..).." - CCCP-82060