Fix foldMapDefaultL

Previously,
```purescript
foldMapDefaultL singleton [1, 2] = [2, 1]
```
This commit fixes this:
```purescript
  foldMapDefaultL singleton [1, 2]
= foldMapDefaultR singleton [1, 2]
= [1, 2]
```

Author: Martin Bidlingmaier

src/Data/Foldable.purs

@@ -115,7 +115,7 @@ foldMapDefaultL
   => (a -> m)
   -> f a
   -> m
-foldMapDefaultL f = foldl (\acc x -> f x <> acc) mempty
+foldMapDefaultL f = foldl (\acc x -> acc <> f x) mempty
 
 instance foldableArray :: Foldable Array where
   foldr = foldrArray