remove unused threads commandline options

packaging/systemd/wesnothd.service.in

@@ -11,7 +11,7 @@ After=network.target
 # Deleting the pipe resets owner, group and mode
 ExecStartPre=/bin/rm -f @FIFO_DIR@/socket
 
-ExecStart=@CMAKE_INSTALL_FULL_BINDIR@/wesnothd@BINARY_SUFFIX@ -t 2 -T 5
+ExecStart=@CMAKE_INSTALL_FULL_BINDIR@/wesnothd@BINARY_SUFFIX@
 # You can use -c to specify the same configuration file
 # which is used when starting wesnothd from within the wesnoth UI
 # e.g. -c /home/user/.local/share/wesnoth/1.14/lan_server.cfg

src/server/wesnothd/server.cpp

@@ -3053,7 +3053,7 @@ int main(int argc, char** argv)
 			keep_alive = true;
 		} else if(val == "--help" || val == "-h") {
 			std::cout << "usage: " << argv[0]
-					  << " [-dvV] [-c path] [-m n] [-p port] [-t n]\n"
+					  << " [-dvV] [-c path] [-m n] [-p port]\n"
 					  << "  -c, --config <path>        Tells wesnothd where to find the config file to use.\n"
 					  << "  -d, --daemon               Runs wesnothd as a daemon.\n"
 					  << "  -h, --help                 Shows this usage message.\n"