Restore DOM effect to both usages of effect row for EventListener

[garyb]

This seems to be causing problems: purescript-halogen/purescript-halogen#440 (comment)

@nwolverson, @natefaubion - technically this is a breaking change, but since the current thing is breaking more stuff, do you think a patch release would be acceptable instead?

[garyb]

Actually, this doesn't fix the problem. For the Halogen case to work, I need to change this too:

foreign import eventListener
  :: forall eff a
   . (Event -> Eff (dom :: DOM | eff) a)
  -> EventListener (dom :: DOM | eff)

Seems wrong to me...

[garyb]

Actually, maybe not 🙈... will find out for sure once I've fixed some other errors.

[garyb]

Ok yeah, just the change in this PR is required. There was something else going on that made it look like the other change was needed.

[nwolverson]

I don't particularly care about either the particular signature here or the semver usage, I just had a drive-by comment previously but for reference, semver.org suggests a restoring-compatability change does not require a major bump.