fix empty file handling option

apps/files/templates/admin.php

+<?php if($_['uploadChangable']):?>
+
 	<?php OCP\Util::addscript('files', 'admin'); ?>
 
 	<form name="filesForm" class="section" action="#" method="post">
 		<h2><?php p($l->t('File handling')); ?></h2>
-	<?php if($_['uploadChangable']):?>
 		<label for="maxUploadSize"><?php p($l->t( 'Maximum upload size' )); ?> </label>
 		<input type="text" name='maxUploadSize' id="maxUploadSize" value='<?php p($_['uploadMaxFilesize']) ?>'/>
 		<?php if($_['displayMaxPossibleUploadSize']):?>
 			(<?php p($l->t('max. possible: ')); p($_['maxPossibleUploadSize']) ?>)
 		<?php endif;?>
 		<br/>
-	<?php endif;?>
 		<input type="hidden" value="<?php p($_['requesttoken']); ?>" name="requesttoken" />
 		<input type="submit" name="submitFilesAdminSettings" id="submitFilesAdminSettings"
 			   value="<?php p($l->t( 'Save' )); ?>"/>
 	</form>
+
+<?php endif;?>