Fixed #3964 Design missing when impersonating

Till Brehm

2016-06-16 dc4dd5a2e619a9be7434ae6a44db9ed34782f091

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<tmpl_dyninclude name="content_tpl">
<input type="hidden" name="_csrf_id" value="{tmpl_var name='_csrf_id'}" />
<input type="hidden" name="_csrf_key" value="{tmpl_var name='_csrf_key'}" />