Wrong column headers displayed after Evaluation Event added to incident editor

[jdalbey]

Create new incident.
In incident editor, create a "Tow" event at time zero.
Create a "CAD Evaluation" event at 10 minutes.
Note in the event editor the form displays column headers "Scale" and "Criteria" as they should.
Create a "Telephone" event at 5 minutes. Note in the event editor the form displays incorrect column headers "Scale" and "Criteria", instead of "Role" and "Dialog".

Note this defect may get fixed as a side effect of fixing #218.