EBN Fixes

[Maksim Orlovich]

> Just a couple of really basic EBN fixes to khtml which I did whilst
> waiting for something to compile :). Assuming they're OK, could
> someone please commit them since I don't have an svn account.

-  return "[object " + className() + "]";
+  return "[object " + className() + ']';

How does this even compile? UString only has an operator+ working on
UStrings, and the single-char ctor for it is explicit.

Ditto for:
     if (id == HTMLDocument::WriteLn)
-      str += "\n";
+      str += '\n';

.. and a bunch of other locations.