[KQP] Use OlapPushdown aggregate in compile service (#23636)

Author: denis0x0D

ydb/core/kqp/compile_service/kqp_compile_service.cpp

@@ -351,7 +351,7 @@ class TKqpCompileService : public TActorBootstrapped<TKqpCompileService> {
 
         ui32 defaultLangVer = TableServiceConfig.GetDefaultLangVer();
 
-        bool enableOlapPushdownAggregate = TableServiceConfig.GetEnableOlapPushdownProjections();
+        bool enableOlapPushdownAggregate = TableServiceConfig.GetEnableOlapPushdownAggregate();
 
         TableServiceConfig.Swap(event.MutableConfig()->MutableTableServiceConfig());
         LOG_INFO(*TlsActivationContext, NKikimrServices::KQP_COMPILE_SERVICE, "Updated config");