[Bugs] #1653 UNSP: jarabe.journal.model defaults to invalid order_by=-mtime

[Sugar Labs Bugs]

#1653: jarabe.journal.model defaults to invalid order_by=-mtime
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    Reporter:  sascha_silbe               |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Trivial                    |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  New                        
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 jarabe.journal.model.find() sets the default value of order_by to -mtime,
 but the data store only recognizes +/-timestamp. Since we usually want the
 most recent entry to come first +timestamp should be the default, matching
 the data store default. So we can either fix it to read +timestamp or just
 drop it. The result is the same in all cases; dropping it means less code
 to execute, less opportunity to be wrong in the future and slightly less
 data to transfer / parse.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1653>
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