[Pidgin] #4856: msimprpl set username commands should use symbolic constants

[Pidgin]

#4856: msimprpl set username commands should use symbolic constants
----------------------+-----------------------------------------------------
 Reporter:  jeff      |       Owner:  jeff 
     Type:  defect    |      Status:  new  
 Priority:  minor     |   Milestone:  2.4.0
Component:  MySpace   |     Version:  2.3.1
 Keywords:  msimprpl  |     Pending:  0    
----------------------+-----------------------------------------------------
 Define symbolic constants for the dsn=9,lid=14 command instead of using
 the literal numbers.

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Ticket URL: <http://developer.pidgin.im/ticket/4856>
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