[IMRF-86] Remove unused `IThingAll` imports

[chshersh]

Consider next module:

import Language.Haskell.Exts (Module (..))

foo :: Module
foo = undefined

(..) part is not used and can be removed safely in this case. Though, ghc doesn't complain about unused (..) part. Maybe there's something I'm missing but (..) can be removed. And this is easily doable with importify.