Changed how suffixes work in generate.py

[adedamola-sode]

No description provided.

[niamhdougan]

Tested by adding a fake R field to an IMG and it propagated through to the final screen, I would have expected it to fail? Or at least populate the macros with the extra field.

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.78%. Comparing base (8972d7e) to head (8abe320).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/techui_builder/generate.py	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   69.87%   69.78%   -0.10%     
==========================================
  Files           6        6              
  Lines         415      427      +12     
==========================================
+ Hits          290      298       +8     
- Misses        125      129       +4     

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