Volume Rendering require coloring array to be set to work correctly

[mwestphal]

Describe the bug
F3D recently decoupled --scalars into --scalar-coloring and --coloring-array option, however this is an unepexted effect on --volume behavior when not using --scalar-coloring

To Reproduce
Steps to reproduce the behavior:

1. Open the file using f3d --dry-run ../src/testing/data/waveletArrays.vti -v --coloring-array=Result -b
2. Incorrect array is used

Expected behavior
Correct array is used for rendering

F3D Information
Paste the content of f3d --version: master

Additional context

A workaround is to have -s in the command line.

Should not be fixed before #1609 is merged

This is caused by the vtkF3DRendererWithColoring::SetColoring with enable set to false which in turn ignore the array name.