explicitly set permissions on newly created folders

this works around any `umask` that might be set and limiting the folder permissions

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/Storage/Local.php

@@ -86,7 +86,10 @@ class Local extends \OC\Files\Storage\Common {
 	}
 
 	public function mkdir($path) {
-		return @mkdir($this->getSourcePath($path), 0777, true);
+		$sourcePath = $this->getSourcePath($path);
+		$result = @mkdir($sourcePath, 0777, true);
+		chmod($sourcePath, 0755);
+		return $result;
 	}
 
 	public function rmdir($path) {