BUG:9826 Fix texture coordinates in tube filter

Thanks Edice for the patch via http://www.vtk.org/Bug/view.php?id=9826

Change-Id: I5727b772abf7fd4a102cf79907b82b5f2780102e
Merge topic '9826-fix-tube-filter-textures' into master

e446b3ad BUG:9826 Fix texture coordinates in tube filter