fix: 5830 - sorted "more photos" by timestamp

[monsieurtanuki]

What

• Now "more photos" are sorted by descending timestamps, instead of descending ids.

Screenshots

before	after

Fixes bug(s)

• Closes: #5830

Impacted file

• product_cards_helper.dart: sorted "more photos" by timestamp

[codecov-commenter]

Codecov Report

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

Project coverage is 6.92%. Comparing base (4d9c7fc) to head (6cd9490). Report is 469 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/smooth_app/lib/helpers/product_cards_helper.dart	0.00%	9 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5843 +/- ## ========================================== - Coverage 9.54% 6.92% -2.63% ========================================== Files 325 422 +97 Lines 16411 23249 +6838 ========================================== + Hits 1567 1609 +42 - Misses 14844 21640 +6796 ```

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[monsieurtanuki]

Thank you @g123k for your review!