fix: Raster cache should support ErrorBuilder

[g123k]

Hi everyone!

As noticed by @monsieurtanuki, the Signal Conso logo is not working offline, even if it's in the cache assets.
The reason was that the error callback was not fetching the image in the cache

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 7.16%. Comparing base (4d9c7fc) to head (2652c16).
Report is 243 commits behind head on develop.

Files	Patch %	Lines
...oth_app/lib/cards/category_cards/raster_cache.dart	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5475      +/-   ##
==========================================
- Coverage     9.54%   7.16%   -2.39%     
==========================================
  Files          325     391      +66     
  Lines        16411   20404    +3993     
==========================================
- Hits          1567    1462     -105     
- Misses       14844   18942    +4098     

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[monsieurtanuki]

Hi @g123k!
Please consider avoiding copy/paste, for maintenance reasons.

[g123k]

Hi @g123k! Please consider avoiding copy/paste, for maintenance reasons.

Good point!
Should be OK now 🫢

[monsieurtanuki]

Thank you @g123k for the quick improvement!