interfaces: fixup packet capture copyrights

The file came from Scott Dale in 2007 like some of the others.
While there, also fix Deciso update from 2014->2016 in our tree.

See: https://github.com/pfsense/pfsense/commit/ab6a5cfc

src/www/diag_packet_capture.php

 <?php
 
 /*
-    Copyright (C) 2016 Deciso B.V.
+    Copyright (C) 2014-2016 Deciso B.V.
+    Copyright (C) 2007 Scott Dale
 
     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions are met: