[Bugs] #2245 UNSP: Calculate uses private API

[Sugar Labs Bugs]

#2245: Calculate uses private API
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    Reporter:  tomeu                      |          Owner:  rwh                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  r?                         
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 This patch removes usage of a private member that has been removed in
 0.90.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2245>
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