fix possible state change after ofDrawRotationAxes()

ofDrawRotationAxes would set glDisable(GL_DEPTH_TEST) upon returning, which differs from how comparable methods behave. These use ofPushStyle and ofPopStyle to restore state.

This should bring ofDrawRotationAxes in line.

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>
Merge pull request #2264 from tgfrerer/fix-drawRotationAxes-state-change

fix possible state change after ofDrawRotationAxes()