[sim] Fix ADXRS450_GyroSim and DutyCycleEncoderSim (#2963)

These were broken by #2952.

Also fix Java ADXRS450_Gyro angle/rate SimValue names.

wpilibc/src/main/native/include/frc/DutyCycleEncoder.h

@@ -183,6 +183,7 @@ class DutyCycleEncoder : public ErrorBase,
 
   hal::SimDevice m_simDevice;
   hal::SimDouble m_simPosition;
+  hal::SimDouble m_simDistancePerRotation;
   hal::SimBoolean m_simIsConnected;
 };
 }  // namespace frc