Fix usage

src/Console/Storage.php

@@ -106,7 +106,7 @@ HELP;
 		$this->out(sprintf($rowfmt, 'Sel', 'Name'));
 		$this->out('-----------------------');
 		$isregisterd = false;
-		foreach ($this->storageManager->listBackends() as $name => $class) {
+		foreach ($this->storageManager->listBackends() as $name) {
 			$issel = ' ';
 			if ($current && $current::getName() == $name) {
 				$issel = '*';

src/Core/StorageManager.php

@@ -215,7 +215,7 @@ class StorageManager
 	/**
 	 * Get registered backends
 	 *
-	 * @return Storage\IWritableStorage[]
+	 * @return string[]
 	 */
 	public function listBackends(): array
 	{

src/Module/Admin/Storage.php

@@ -96,7 +96,7 @@ class Storage extends BaseAdmin
 		$current_storage_backend = DI::storage();
 		$available_storage_forms = [];
 
-		foreach (DI::storageManager()->listBackends() as $name => $class) {
+		foreach (DI::storageManager()->listBackends() as $name) {
 
 			// build storage config form,
 			$storage_form_prefix = preg_replace('|[^a-zA-Z0-9]|', '', $name);