Remove unused file.

apps/contacts/templates/part.edit_categories_dialog.php

-<?php
-$categories = isset($_['categories'])?$_['categories']:array();
-?>
-<div id="edit_categories_dialog" title="<?php echo $l->t('Edit categories'); ?>">
-<!-- ?php print_r($types); ? -->
-	<form method="post" id="categoryform">
-	<div class="scrollarea">
-	<ul id="categorylist">
-	<?php foreach($categories as $category) { ?>
-	<li><input type="checkbox" name="categories[]" value="<?php echo $category; ?>" /><?php echo $category; ?></li>
-	<?php } ?>
-	</ul>
-	</div>
-	<div class="bottombuttons"><input type="text" id="category_addinput" name="category" /><button id="category_addbutton" disabled="disabled"><?php echo $l->t('Add'); ?></button></div>
-	</form>
-</div>