replace call to setqftitle w/ alternate version for proposed vim patch

Christian Brabandt submitted[1] a patch to vim-dev for setting a
persistent qf title which is now on the vim todo list. So, remove the
code which uses my patch and replace it with a commented out version of
code which can be enabled if/when Christian's patch is applied.

[1] https://groups.google.com/d/msg/vim_dev/X7VVPd4Do5s/svKaV6Eah6YJ

refs #3