import entry.time (not entry.start_time) for procedure orders

Measures that do time comparisons (e.g. 0441) expect an entry #time or both an #start_time and #end_time. Since the procedure order occurs at a single time-point, use the #time value.

See discussion at: https://groups.google.com/forum/#!topic/pophealth-dev/sT1KLFrtzKc