use correct magic var in php entry scripts to hold script folder structure independent of call folder

fix php socket location in postinst script

api/video.php

@@ -1,5 +1,5 @@
 <?php
-include_once './src/handlers/Video.php';
+include_once __DIR__ . '/src/handlers/Video.php';
 
 $video = new Video();
 $video->handleAction();