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

@@ -1476,6 +1476,7 @@ void initServer() {
         server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
     }
 
+    replicationScriptCacheInit();
     scriptingInit();
     slowlogInit();
     bioInit();