[Pidgin] #4273: Update xmpp avatar restrictions for current XEP-0084

[Pidgin]

#4273: Update xmpp avatar restrictions for current XEP-0084
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  Reporter:  chckens  |       Owner:  nwalp
      Type:  patch    |      Status:  new  
  Priority:  minor    |   Milestone:       
 Component:  XMPP     |     Version:  2.3.0
Resolution:           |    Keywords:       
   Pending:  0        |  
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Comment (by chckens):

 #3450 is another likely to be resolved by this patch.

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Ticket URL: <http://developer.pidgin.im/ticket/4273#comment:1>
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