Minor simplification

haskell-src/exec/Main.hs

@@ -151,8 +151,7 @@ runMigrations pool logg migAction migrations = do
   baseFiles <- case migrationsFolderBase migrations of
     Just migFolder -> getDir migFolder
     Nothing -> return baseMigrationFiles
-  extraFiles <- flip foldMap (migrationsFolderExtra migrations) $
-    \migFolder -> getDir migFolder
+  extraFiles <- foldMap getDir $ migrationsFolderExtra migrations
   let migrationFiles = baseFiles ++ extraFiles
 
   let steps = map (uncurry Mg.MigrationStep) migrationFiles