Testbed does not follow the definition of "getRoll()" in Drone.java

[ToonDeb]

When the drone is pitched forwards, so the pitch passes 90 degrees and the drone has turned upside down, the roll should become greater then 90°, as the drone is now upside down.

Yet when you do this maneuver in the provided testbed, the result of "getRoll()" remains 0°, instead of turning to 180° (see attached image)

This makes all controllers unusable in the testbed, as the drone thinks it has rolled 180°