Use tags-table-list instead of tags-file-name

[geraldus]

No description provided.

[gracjan]

In toplevel form:
haskell-commands.el:659:32:Error: malformed let binding: `(add-to-list (quote tags-table-list) (haskell-session-tags-filename (haskell-process-session (car state))))'
make: *** [haskell-commands.elc] Error 1

See here:

https://travis-ci.org/haskell/haskell-mode/jobs/59447137

[geraldus]

@gracjan indeed! Please ping me on IRC, when you'll be online.

[gracjan]

Why did you close it?

[geraldus]

I don't know another way to get rid of all old commits to a single one yet.

[gracjan]

This: git rebase -i, squash squash squash, git push origin +tmp.

[geraldus]

Will try next time! Here is new PR #592