Update scale factor and offset [viirs_l1b]

[zxdawn]

The scale factor and offset should be updated for BT data. The easiest way seems to be updating these parameters using the factor output.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (5984c29) to head (9f9dbda).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3016   +/-   ##
=======================================
  Coverage   96.10%   96.10%           
=======================================
  Files         377      377           
  Lines       55163    55182   +19     
=======================================
+ Hits        53012    53031   +19     
  Misses       2151     2151           

Flag	Coverage Δ
behaviourtests	3.94% <0.00%> (-0.01%)	⬇️
unittests	96.19% <100.00%> (+<0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 12332194278

Details

• 19 of 19 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 96.208%

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Totals
Change from base Build 12299617024:	0.002%
Covered Lines:	53275
Relevant Lines:	55375

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💛 - Coveralls