Display what sector trying to move to, not final.

dispatchers.cpp

@@ -621,7 +621,7 @@ void MoveDispatch::server_prompt(const std::string &prompt) {
         } else {
           to_server("N");
           BUGZ_LOG(fatal) << "density_clear(" << to_check << ") : false";
-          why_failed = str(boost::format("Sector %1% has density %2%.") % move_to %
+          why_failed = str(boost::format("Sector %1% has density %2%.") % to_check %
                            d.density);
           success = false;
           deactivate();