[wpimath] PIDController: Reset position and velocity error when reset() is called. (#4064)

In addition to m_prevError and m_totalError, m_positionError and
m_velocityError need to be reset to 0 when reset() is called.
Otherwise, the next time calculate() is called, the old values will be
used as the previous error, but this is inaccurate since the caller
wanted to reset the state of the PID controller.

wpimath/src/main/java/edu/wpi/first/math/controller/PIDController.java

@@ -338,8 +338,10 @@ public class PIDController implements Sendable, AutoCloseable {
 
   /** Resets the previous error and the integral term. */
   public void reset() {
+    m_positionError = 0;
     m_prevError = 0;
     m_totalError = 0;
+    m_velocityError = 0;
   }
 
   @Override