Fix for 'Use of undefined constant jpg'

FIX:
PHP Notice:  Use of undefined constant jpg - assumed 'jpg' in /home/abdul/project/whatsapp/WhatsAPI/src/php/whatsprot.class.php on line 2896
I have temp to comment this line 

I have no idea where this contacts.php removed to
Merge pull request #809 from ardianys/master

Fix for 'Use of undefined constant jpg'