Core: Get rid of dirty operator workaround for ACE_Singleton class implementation

--HG--
branch : trunk

src/server/worldserver/RemoteAccess/RASocket.cpp

@@ -213,7 +213,7 @@ int RASocket::check_password(const std::string& user, const std::string& pass)
     AccountMgr::normalizeString(safe_pass);
     LoginDatabase.escape_string(safe_pass);
 
-    std::string hash = sAccountMgr.CalculateShaPassHash(safe_user, safe_pass);
+    std::string hash = sAccountMgr->CalculateShaPassHash(safe_user, safe_pass);
 
     QueryResult check = LoginDatabase.PQuery(
             "SELECT 1 FROM account WHERE username = '%s' AND sha_pass_hash = '%s'",