See #733. Remove dfmt from being default beautifier for D language

examples/nested-jsbeautifyrc/d/expected/test.d

@@ -1,10 +1,7 @@
-class Test
+class Test {
+private int member;
+public auto func ( string str )
 {
-    private int member;
-    public auto func(string str)
-    {
-        import std.stdio;
-
-        writeln("Hello world !");
-    }
+        import std.stdio; writeln("Hello world !");
+}
 }

src/languages/d.coffee

@@ -17,7 +17,7 @@ module.exports = {
     "d"
   ]
 
-  defaultBeautifier: "dfmt"
+  defaultBeautifier: "Uncrustify"
 
   options:
     configPath: