Fix formatting of example configuration file.

Change-Id: I874c07dbb12af4ed56691e5cd499325edeea6a2b
diff --git a/config.example.dhall b/config.example.dhall
index cdf87ae..42451ac 100644
--- a/config.example.dhall
+++ b/config.example.dhall
@@ -13,8 +13,7 @@
           }
 
       , exclusions =
-          [
-          , "**/.stack-work"
+          [ "**/.stack-work"
           , "**/dist-newstyle"
 
           , "${home}/.boot/cache"