do not show lgobal credentials section if you cannot create mounts

Signed-off-by: Simon L <szaimen@e.mail.de>

apps/files_external/templates/settings.php

@@ -218,7 +218,8 @@ function writeParameterInput($parameter, $options, $classes = []) {
 
 <div class="followupsection">
 	<form autocomplete="false" action="#"
-		  id="global_credentials" method="post">
+		  id="global_credentials" method="post"
+		  data-can-create="<?php echo $canCreateMounts?'true':'false' ?>">
 		<h2><?php p($l->t('Global credentials')); ?></h2>
 		<p class="settings-hint"><?php p($l->t('Global credentials can be used to authenticate with multiple external storages that have the same credentials.')); ?></p>
 		<input type="text" name="username"