Switch the default formatter to ormolu

Since brittany isn't included in the static binaries due to licensing
restrictions
Fixes #255

Author: lukel97

package.json

@@ -115,7 +115,7 @@
             "stylish-haskell",
             "none"
           ],
-          "default": "brittany",
+          "default": "ormolu",
           "description": "The tool to use for formatting requests"
         },
         "haskell.trace.server": {