Provide description for services

The argument named "desc" was not actually the description, but
rather the short "display name". Add handling for the actual
description to reduce confusion.
diff --git a/win/winvnc/winvnc.cxx b/win/winvnc/winvnc.cxx
index cb0e8e4..ff16aac 100644
--- a/win/winvnc/winvnc.cxx
+++ b/win/winvnc/winvnc.cxx
@@ -169,6 +169,7 @@
         int j = i;
         i = argc;
         if (rfb::win32::registerService(VNCServerService::Name,
+                                        _T("TigerVNC Server"),
                                         _T("Provides remote access to this machine via the VNC/RFB protocol."),
                                         argc-(j+1), &argv[j+1]))
           MsgBoxOrLog("Registered service successfully");