Fix GHC warning: -Wtype-defaults

Related: https://github.com/xmonad/xmonad-contrib/issues/537

XMonad/Layout/BinaryColumn.hs

@@ -86,7 +86,7 @@ columnLayout (BinaryColumn scale min_size) rect stack = zip ws rects
           m_fl = fromIntegral m
           m_prev_fl = fromIntegral (m + 1)
           div_test = min divide m_prev_fl
-          value_test = (toInteger (round ((fromIntegral size) / div_test)))
+          value_test = round ((fromIntegral size) / div_test) :: Integer
           value_max = size - toInteger (min_size * m)
           (value, divide_next, no_room) =
             if value_test < value_max then
@@ -102,7 +102,7 @@ columnLayout (BinaryColumn scale min_size) rect stack = zip ws rects
         f m size divide True = let
           divide_next = fromIntegral m
           value_even = ((fromIntegral size) / divide)
-          value = (toInteger (round value_even))
+          value = round value_even :: Integer
 
           m_next = m - 1
           size_next = size - value

XMonad/Layout/Tabbed.hs

@@ -223,7 +223,7 @@ instance Eq a => DecorationStyle TabbedDecoration a where
               nx = n x wh
               upperTab = Rectangle nx  y wid (fi ht)
               lowerTab = Rectangle nx (y + fi (hh - ht)) wid (fi ht)
-              fixHeightLoc i = y + fi (((fi ht) * fi i))
+              fixHeightLoc i = y + fi ht * fi i
               fixHeightTab k = Rectangle k
                 (maybe y (fixHeightLoc)
                  $ w `elemIndex` ws) (fi wt) (fi ht)

XMonad/Layout/TallMastersCombo.hs

@@ -469,7 +469,7 @@ instance (GetFocused l a, GetFocused r a) => LayoutClass (ChooseWrapper l r) a w
                 L -> do
                        ml <- handle l NextNoWrap
                        case ml of
-                           Just l0 -> return (L,l0,r,0)
+                           Just l0 -> return (L, l0, r, 0 :: Integer)
                            Nothing -> do
                                   mr <- handle r FirstLayout
                                   case mr of

XMonad/Util/Loggers/NamedScratchpad.hs

@@ -91,7 +91,7 @@ nspTrackHook _ (DestroyWindowEvent {ev_window = w}) = do
   return (All True)
 nspTrackHook ns (ConfigureRequestEvent {ev_window = w}) = do
   NSPTrack ws <- XS.get
-  ws' <- forM (zip3 [0..] ws ns) $ \(_,w',NS _ _ q _) -> do
+  ws' <- forM (zip3 [0 :: Integer ..] ws ns) $ \(_,w',NS _ _ q _) -> do
     p <- runQuery q w
     return $ if p then Just w else w'
   XS.put $ NSPTrack ws'