fix groups usage grouping (#9867)

Author: adameat

ydb/core/viewer/storage_groups.h

@@ -547,7 +547,6 @@ class TStorageGroups : public TViewerPipeClient {
     const TFieldsType FieldsAll = TFieldsType().set();
     const TFieldsType FieldsBsGroups = TFieldsType().set(+EGroupFields::GroupId)
                                                     .set(+EGroupFields::Erasure)
-                                                    .set(+EGroupFields::Usage)
                                                     .set(+EGroupFields::Used)
                                                     .set(+EGroupFields::Limit)
                                                     .set(+EGroupFields::Latency);