[otrs] Remove lock option from tickets

[Richard Hinkamp - BeSite]

Disabling locks is not the way to go imho. Locks are great for 
preventing double answers etc (2 people handling the same ticket at the 
same time and giving different answers to the customer for example :S). 
What you problably want is an auto unlock after an answer. What you can 
do is setting the default state after answering a ticket to "closed 
succesful", in config:
$Self->{'Ticket::DefaultNextComposeType'} = 'closed successful';

This way a ticket is closed by default after answering. When a new reply 
comes from the customer, it will show in the main queue again, without a 
lock. This way you can share all tickets with all people and only lock 
the ticket when you are handling the ticket (and this way prevent double 
handling of same ticket).

Richard