Sysop can chat with nodes that aren't logged-in (at logon prompt, new users)

Be sure to let them select a node even when no nodes are technically "in use".
As requested by Nelgin in IRC (what, no gitlab issue?)

src/sbbs3/chat.cpp

@@ -1262,7 +1262,7 @@ int sbbs_t::getnodetopage(int all, int telegram)
 		getnodedat(i,&node,0);
 		if(i==cfg.node_num)
 			continue;
-		if(node.status==NODE_INUSE || (SYSOP && node.status==NODE_QUIET)) {
+		if(node.status==NODE_INUSE || (SYSOP && node.status >= NODE_LOGON && node.status <= NODE_QUIET)) {
 			if(!lastnodemsg)
 				lastnodemsg=i;
 			j++;