Shading loss misattributed to module difference from STC

[brtietz]

Describe the bug

Creating a scene with the 3D shade calculator reduces DC energy by 12.8%, but only 0.6% of this is attributed to shading in the loss table, the rest is attributed to module difference from STC.

To Reproduce

Steps to reproduce the behavior:

1. Download the attached SAM file

shading_bug_sample_case.zip

2. Run both cases
3. Look at the loss diagram
4. See error

Expected behavior

I would expect shading losses to be attributed to shading