fix(ngdoc/macro.html): default param values are in doc.defaultValue property

Closes #58

Author: thorn0

ngdoc/templates/lib/macros.html

@@ -24,7 +24,7 @@
       </td>
       <td>
         {$ param.description | marked $}
-        {% if param.default %}<p><em>(default: {$ param.default $})</em></p>{% endif %}
+        {% if param.defaultValue %}<p><em>(default: {$ param.defaultValue $})</em></p>{% endif %}
       </td>
     </tr>
     {% endfor %}