Those coils get hot and quit with age. They are very easy to replace but hard to diagnose.
If the sensor is working which it is, and the ignitor is working which it is, and you have a good control, which you do, then change these pesky rascals. Click on pic to enlarge. Yep that is a good part number.
Coil Kit for Dryer Gas Valve (2 Coils, New Style), AP3094251