[Filesystem] fix lock file permissions

Author: fritzmg

src/Symfony/Component/Filesystem/LockHandler.php

@@ -77,7 +77,7 @@ public function lock($blocking = false)
 
         if (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
             if ($this->handle = fopen($this->file, 'x')) {
-                chmod($this->file, 0444);
+                chmod($this->file, 0644);
             } elseif (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
                 usleep(100); // Give some time for chmod() to complete
                 $this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r');