Some cameras don't provide the JFIF header, so don't require it.
Some cameras don't provide the JFIF header, so don't require it.

This fixes DHT not being inserted on some images.

ThadHouse/cameraserver,wpilibsuite/cscore,wpilibsuite/cscore,ThadHouse/cameraserver,ThadHouse/cameraserver,wpilibsuite/cscore