Remove old commented code

Author: alex-kulakov

Orm/Xtensive.Orm/Orm/Linq/Translator.Expressions.cs

@@ -1691,14 +1691,6 @@ private void EnsureEntityReferenceIsJoined(EntityFieldExpression entityFieldExpr
 
       var oldDataSource = originalItemProjector.DataSource;
       var offset = oldDataSource.Header.Length;
-      //var shouldUseLeftJoin = false;
-
-      //var sourceToCheck = (oldDataSource is FilterProvider filterProvider) ? filterProvider.Source : oldDataSource;
-      //if ((sourceToCheck is ApplyProvider applyProvider && applyProvider.ApplyType == JoinType.LeftOuter) ||
-      //    (sourceToCheck is JoinProvider joinProvider && joinProvider.JoinType == JoinType.LeftOuter)) {
-      //  shouldUseLeftJoin = true;
-      //}
-
       var newDataSource = entityFieldExpression.IsNullable || oldDataSource.CheckIfUseLeftJoin()
         ? oldDataSource.LeftJoin(joinedRs, keyPairs)
         : oldDataSource.Join(joinedRs, keyPairs);