feat(haskell): tweak highlights

* add cases for `qualified_variable`

* add function defined in terms of composition

tests/query/highlights/haskell/test.hs

@@ -171,6 +171,8 @@ someIOaction = do
       gunc x y = func x $ y + 7
                    -- ^ @variable
                        -- ^ @variable
+      valueFromList = HashSet.fromList []
+      -- ^ @variable
   when foo $ putStrLn $ T.showt =<< bar
  -- ^ @function.call
      -- ^ @variable
@@ -325,3 +327,6 @@ lambdaAlias _ _ _ = undefined
 spec :: Spec
 spec = describe "test ns" $ it "test case" pending
 -- ^ @variable
+
+composed = f . g
+-- ^ @function