set proper type of button.

mockup/personmock.html

@@ -656,7 +656,7 @@
                         <div class="col-md-6">
                             <div class="uploaded-file "><span class="uploaded-file-name">john.doe.png</span>
                                 <button class="delete-file" data-sip="filedeletesip"
-                                        name="trash-picture:1"><span
+                                        name="trash-picture:1" type="button"><span
                                         class="glyphicon glyphicon-trash"></span></button>
                             </div>
                             <input id="fileupload" name="picture:1" disabled="disabled" class="hidden" type="file"