haskell: fix haskell-indentation eval-after-load
haskell: fix haskell-indentation eval-after-load

The `progn` in the eval-after-load was not quoted, so it was being
evaluated unconditionally. This led to the haskell-indentation guides
being unconditionally enabled.

Additionally, only enable the indentation guides when
haskell-indentation-mode is on.

Resolves #1136.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs