Fix double disable segfaulting interrupts (#2132)

Also fixes DigitalOutput not closing correctly.

wpilibj/src/main/java/edu/wpi/first/wpilibj/DigitalOutput.java

@@ -44,6 +44,7 @@ public class DigitalOutput extends DigitalSource implements Sendable, AutoClosea
 
   @Override
   public void close() {
+    super.close();
     SendableRegistry.remove(this);
     // Disable the pwm only if we have allocated it
     if (m_pwmGenerator != invalidPwmGenerator) {