[Joomla] Phoca Gallery 2.7去版权的方法

如下修改：

components/com_phocagallery/views/categories/view.html.php
220行：$tmpl['ab'] = '';

components/com_phocagallery/views/category/view.html.php
168行：$tmpl['md'] = '';
171行：$tmpl['em'] = '';