Support Inky Impression 7.3 7-color

[briancharous]

This PR adds support for the Inky Impression 7.3 7-color model. The only relevant change is mapping the PCB variant to the device model when trying to detect the device's opts.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.2%. Comparing base (6b31587) to head (fc87be6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
inky/opts.go	0.0%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.0%) is below the target coverage (40.0%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #107     +/-   ##
=======================================
- Coverage   52.2%   52.2%   -0.0%     
=======================================
  Files        113     113             
  Lines      14276   14278      +2     
=======================================
  Hits        7457    7457             
- Misses      6473    6475      +2     
  Partials     346     346             

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[maruel]

Thanks!