Category edit form should use return url (#36560)

Currently the article edit form respects return URLs; the category edit form does not. Adding it here makes for a more consistent editing experience.

administrator/components/com_categories/tmpl/category/edit.php

@@ -124,6 +124,7 @@
 
 		<?php echo $this->form->getInput('extension'); ?>
 		<input type="hidden" name="task" value="">
+		<input type="hidden" name="return" value="<?php echo $input->getBase64('return'); ?>">
 		<input type="hidden" name="forcedLanguage" value="<?php echo $input->get('forcedLanguage', '', 'cmd'); ?>">
 		<?php echo HTMLHelper::_('form.token'); ?>
 	</div>