Fix hlint warnings for hlint v2.1.20 (#1320)

* Apply some hlint suggestions.

* Simplify config parser (to avoid hlint error)

* Reorganize for clarity (and fix hlint error)

* Remove redundant language extension

* Reformat slice more conventionally to avoid hlint bug

* Refactor for clarity (and to avoid hlint error)

* Simplify (and avoid hlint error)

* Fix hlint complaint

src/PostgREST/OpenAPI.hs

@@ -349,7 +349,7 @@ isUriValid:: URI -> Bool
 isUriValid = fAnd [isSchemeValid, isQueryValid, isAuthorityValid]
 
 fAnd :: [a -> Bool] -> a -> Bool
-fAnd fs x = all ($x) fs
+fAnd fs x = all ($ x) fs
 
 isSchemeValid :: URI -> Bool
 isSchemeValid URI {uriScheme = s}