fix short period of server.hz being uninitialized

server.hz was uninitialized between initServerConfig and initServer.
this can lead to someone (e.g. queued modules) doing createObject,
and accessing an uninitialized variable, that can potentially be 0,
and lead to a crash.

src/server.c

@@ -1529,7 +1529,7 @@ void initServerConfig(void) {
     server.timezone = getTimeZone(); /* Initialized by tzset(). */
     server.configfile = NULL;
     server.executable = NULL;
-    server.config_hz = CONFIG_DEFAULT_HZ;
+    server.hz = server.config_hz = CONFIG_DEFAULT_HZ;
     server.dynamic_hz = CONFIG_DEFAULT_DYNAMIC_HZ;
     server.arch_bits = (sizeof(long) == 8) ? 64 : 32;
     server.port = CONFIG_DEFAULT_SERVER_PORT;