remove trailing whitespace from snack-lib/default.nix

Author: hyperfekt

snack-lib/default.nix

@@ -183,15 +183,15 @@ with rec
 
     buildHoogle = packagePath:
       let
-        concatUnion = lists: 
+        concatUnion = lists:
           let
             sets = map (l: pkgs.lib.genAttrs l (_: null)) lists;
             union = pkgs.lib.foldAttrs (n: a: null) {} sets;
           in
             builtins.attrNames union;
         allDeps = concatUnion (map (spec: spec.packageDependencies {}) (specsFromPackageFile packagePath));
         drv = haskellPackages.hoogleLocal { packages = map (p: haskellPackages.${p}) allDeps; };
-      in 
+      in
       writeText "hoogle-json"
       ( builtins.toJSON
           { build_type = "hoogle";