Base cursor declaration translation fixed

Author: alex-kulakov

Orm/Xtensive.Orm/Sql/Compiler/SqlCompiler.cs

@@ -920,7 +920,7 @@ public virtual void Visit(SqlDeclareCursor node)
         AppendTranslated(node, DeclareCursorSection.Holdability);
         AppendTranslated(node, DeclareCursorSection.Returnability);
         AppendTranslated(node, DeclareCursorSection.For);
-
+        AppendSpaceIfNecessary();
         node.Cursor.Query.AcceptVisitor(this);
         if (node.Cursor.Columns.Count != 0) {
           foreach (SqlColumnRef item in node.Cursor.Columns) {