COMP: Fix overloaded virtual warnings with VTKv6

Explicitly use base class implementations of transform overloads
operating on 'float' (which cast and call the double overloads, and so
will call the appropriate derived code) in order to avoid hiding the
overloads in the derived class. (Fixes -Woverloaded-virtual warnings.)

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23316 3bd1e089-480b-0410-8dfb-8563597acbee