Remove delay from end of volTM2DRotateClip.py.

This reverts commit fd54bd37, which was a test to see if adding a
delay would fix a dashboard test.

Change-Id: I55e82e13a1829847f71b2ecdf1736454c1cc8a18
Merge topic 'vtkTM2DRotateClip-nodelay' into master

a1049edc Remove delay from end of volTM2DRotateClip.py.