Move Replication Script Cache initialization in safer place.

It should be called just one time at startup and not every time the Lua
scripting engine is re-initialized, otherwise memory is leaked.

src/redis.c

@@ -1517,6 +1517,7 @@ void initServer() {
     }
 
     if (server.cluster_enabled) clusterInit();
+    replicationScriptCacheInit();
     scriptingInit();
     slowlogInit();
     bioInit();