Initialize calibration values when loading from metadata files

[ziw-liu]

Previously loading calibration from a metadata file does not initialize LC values in the QLIPP_Calibration object created by the load_calibration thread worker, which causes an error when trying to capture background afterwards. This PR addresses the error by setting the required values, although the necessity of fully initializing the QLIPP_Calibration object when loading from metadata files is still up to debate.

[ziw-liu]

I'm not currently labelling this issue as automatically closing #180 upon merging. Feel free to change it as needed.

[deprecated-napari-hub-preview-bot]

Preview page for your plugin is ready here:
https://preview.napari-hub.org/mehta-lab/recOrder/184
Created: 2022-09-20T00:47:08.439223

[codecov-commenter]

Codecov Report

Merging #184 (e423fa7) into main (c70b2ed) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
- Coverage   11.20%   11.17%   -0.03%     
==========================================
  Files          45       45              
  Lines        5987     6002      +15     
==========================================
  Hits          671      671              
- Misses       5316     5331      +15     

Impacted Files	Coverage Δ
recOrder/plugin/workers/calibration_workers.py	0.00% <0.00%> (ø)
recOrder/io/utils.py	0.00% <0.00%> (ø)
recOrder/plugin/widget/main_widget.py	0.00% <0.00%> (ø)

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[talonchandler]

Thanks @ziw-liu!

I just tested, and everything is working as I expect. I will link #180 since this fixes that issue.

My only question is about the new import statement. Is it necessary?

As we discussed, the data flow in the calibration metadata files is a bit wonky right now. We'll design this more carefully and clean this up for 1.0.0.

Thanks!