devel/hs-haskell-language-server: Remove duplicate distinfo entries

These duplicate entries were causing build failures at the fetch stage.

> lens-5.3.5/lens-5.3.5.tar.gz doesn't seem to exist in /portdistfiles/cabal.

> Attempting to fetch https://hackage.haskell.org/package/lens-5.3.5/lens-5.3.5.tar.gz

fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory

> Attempting to fetch http://hackage.haskell.org/package/lens-5.3.5/lens-5.3.5.tar.gz

fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory

> Attempting to fetch http://distcache.FreeBSD.org/ports-distfiles/cabal/lens-5.3.5/lens-5.3.5.tar.gz

fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory

> Couldn't fetch it - please try to retrieve this

> port manually into /portdistfiles/cabal and try again.

• Error code 1

Reviewed by: arrowd
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D55042