mysql --skip-column-names flag should not affect alignment of field values,

set num_flag[] unconditionally, not under "if (column_names)"

http://ronaldbradford.com/blog/unexplained-trivial-mysql-behavior-2013-08-02/

mysql-test/t/mysql.test

@@ -603,5 +603,10 @@ delimiter
 EOF
 --exec $MYSQL < $MYSQLTEST_VARDIR/tmp/13639125.sql
 
+#
+# --skip-column-names and alignment
+#
+--exec $MYSQL -t -N -e "SELECT 'a' union select 'aaaaaaaaaaaaaaaaa'"
+
 --echo
 --echo End of tests