Fix getting servers from and being listed on id's q3 master server

Use q3 master protocol when com_gamename is Quake3Arena (the default), otherwise use dpmaster protocol.

code/client/cl_main.c

@@ -4145,6 +4145,9 @@ void CL_GlobalServers_f( void ) {
 				com_gamename->string, Cmd_Argv(2));
 		}
 	}
+	else if ( !Q_stricmp( com_gamename->string, LEGACY_MASTER_GAMENAME ) )
+		Com_sprintf(command, sizeof(command), "getservers %s",
+			Cmd_Argv(2));
 	else
 		Com_sprintf(command, sizeof(command), "getservers %s %s",
 			com_gamename->string, Cmd_Argv(2));