fix: 5560 - proof files from PROD/DEV

[monsieurtanuki]

What

• When displaying the proof image files, we used the product PROD/DEV settings instead of the prices PROD/DEV settings
• That's now fixed here. Didn't test it, though, in order to push a quick fix.

Fixes bug(s)

• Fixes: When using "DEV" server for Open Prices, images are still fetched from PROD server #5560

Impacted files

• price_proof_page.dart: used prices PROD/DEV instead of product PROD/DEV settings
• prices_proofs_page.dart: used prices PROD/DEV instead of product PROD/DEV settings

[codecov-commenter]

Codecov Report

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

Project coverage is 6.96%. Comparing base (4d9c7fc) to head (bf02db2).
Report is 292 commits behind head on develop.

Files	Patch %	Lines
.../smooth_app/lib/pages/prices/price_proof_page.dart	0.00%	1 Missing ⚠️
...mooth_app/lib/pages/prices/prices_proofs_page.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5561      +/-   ##
==========================================
- Coverage     9.54%   6.96%   -2.59%     
==========================================
  Files          325     400      +75     
  Lines        16411   21172    +4761     
==========================================
- Hits          1567    1474      -93     
- Misses       14844   19698    +4854     

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[raphael0202]

Thank you!
I will test this on internal