Adding option to copy transcription source from transcription table

[raivisdejus]

Fix for #980

[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.

Project coverage is 81.19%. Comparing base (f61701f) to head (5451c59).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
buzz/widgets/transcription_tasks_table_widget.py	23.07%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #986      +/-   ##
==========================================
- Coverage   81.34%   81.19%   -0.16%     
==========================================
  Files          86       86              
  Lines        5022     5035      +13     
==========================================
+ Hits         4085     4088       +3     
- Misses        937      947      +10     

Flag	Coverage Δ
Linux	80.19% <23.07%> (-0.15%)	⬇️
Windows	80.26% <23.07%> (-0.17%)	⬇️
macOS	81.01% <23.07%> (-0.15%)	⬇️

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