Update Orm/Xtensive.Orm/Sql/Dml/Expressions/SqlCase.cs

Co-authored-by: Alexey Kulakov <alexey.kulakov@dataobjects.net>

Author: SergeiPavlov

Orm/Xtensive.Orm/Sql/Dml/Expressions/SqlCase.cs

@@ -95,7 +95,7 @@ public SqlExpression Else
 
     public override void ReplaceWith(SqlExpression expression)
     {
-      SqlCase replacingExpression = ArgumentValidator.EnsureArgumentIs<SqlCase>(expression);
+      var replacingExpression = ArgumentValidator.EnsureArgumentIs<SqlCase>(expression);
       value = replacingExpression.Value;
       @else = replacingExpression.Else;
       cases.Clear();