Fix JsonMap generation for embedded screens

[OCopping]

Adds another route to determine file path of a file element when generating the JsonMap

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.54%. Comparing base (1e4d2c7) to head (79f8c9e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/techui_builder/builder.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
- Coverage   89.76%   89.54%   -0.22%     
==========================================
  Files           9        9              
  Lines         772      775       +3     
==========================================
+ Hits          693      694       +1     
- Misses         79       81       +2     

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