PRD-4991 - When creating a date parameter, the Date Picker is not putting the value in the default value field.

don't call fireEditingStopped until dateChooserPanel didn't set selectedDate
Merge pull request #347 from aliakseihaidukou/SP-1137

SP-1177 - Backport of PRD-4991 - When creating a date parameter, the Date Picker is not puttin...