Speeding up drawImage by reducing folding_threshold for galaxies with dim fluxes

[eshanjain1]

Every time drawImage() called, the folding_threshold (originally defaulted set to 0.995) is lowered to 0.95 if the average flux across bands is lower than a dim threshold. Use to speed up the drawing process.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.76%. Comparing base (295902b) to head (7299bd0).
Report is 1 commits behind head on master.

Files	Patch %	Lines
bliss/simulator/decoder.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1059      +/-   ##
==========================================
+ Coverage   80.75%   80.76%   +0.01%     
==========================================
  Files          23       23              
  Lines        3061     3068       +7     
==========================================
+ Hits         2472     2478       +6     
- Misses        589      590       +1     

Flag	Coverage Δ
unittests	80.76% <85.71%> (+0.01%)	⬆️

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