MDEV-25080 Fix incorrect view names in printed queries

When printing Item_direct_view_ref the printed field name must be
complemented with the view name/derived table alias.
For example, for "SELECT a FROM (SELECT a FROM t1) q" field `a`
in the select list must be printed as `q`.`a`.

But if the view was merged then the initial `q` does not make sense
any more so field `a` must be printed  as `t1`.`a`

mysql-test/main/opt_trace_security.result

@@ -197,7 +197,7 @@ select * from db1.v1	{
             }
           },
           {
-            "expanded_query": "/* select#1 */ select db1.t1.a AS a from v1"
+            "expanded_query": "/* select#1 */ select v1.a AS a from v1"
           }
         ]
       }