fix: use title_element

[teolemon]

What

• Might solve: The localized title of cards is not picked up #1534
  • "title_element":{"title":"Santé"},"topics":["health"],"type":"card"}
  • "title_element":{"title":""},"topics":["environment"],"type":"card"}
• Unsure if will solve: Duplicated Environnement title in the Knowledge panels (logic error ?) #1540

[teolemon]

error • The getter 'title_element' isn't defined for the type 'KnowledgePanel' • packages/smooth_app/lib/cards/product_cards/knowledge_panels/knowledge_panel_card.dart:34:37 • undefined_getter

[M123-dev]

@teolemon we named it titleElement not title_element in off-dart, updated the PR now just the url launcher deprecation if failing

https://github.com/openfoodfacts/openfoodfacts-dart/blob/527b2e7ea484839ccfc9bb6ffc812b3d966e0924/lib/model/KnowledgePanel.dart#L82

[codecov-commenter]

Codecov Report

Merging #1620 (19c528f) into develop (2ea0da3) will decrease coverage by 0.14%.
The diff coverage is 1.79%.

@@            Coverage Diff             @@
##           develop   #1620      +/-   ##
==========================================
- Coverage     8.86%   8.71%   -0.15%     
==========================================
  Files          161     164       +3     
  Lines         6623    6789     +166     
==========================================
+ Hits           587     592       +5     
- Misses        6036    6197     +161     

Impacted Files	Coverage Δ
...t_cards/knowledge_panels/knowledge_panel_card.dart	0.00% <0.00%> (ø)
...rds/knowledge_panels/knowledge_panels_builder.dart	2.17% <0.00%> (ø)
...s/product_cards/smooth_product_card_not_found.dart	0.00% <0.00%> (ø)
.../smooth_app/lib/data_models/onboarding_loader.dart	0.00% <ø> (ø)
...mooth_app/lib/data_models/product_query_model.dart	1.38% <ø> (ø)
...s/smooth_app/lib/data_models/user_preferences.dart	34.42% <ø> (+2.11%)	⬆️
...s/smooth_app/lib/database/dao_string_list_map.dart	0.00% <0.00%> (ø)
...ckages/smooth_app/lib/database/local_database.dart	0.00% <0.00%> (ø)
...s/smooth_app/lib/database/paged_product_query.dart	0.00% <0.00%> (ø)
...oth_app/lib/database/robotoff_questions_query.dart	0.00% <0.00%> (ø)
... and 23 more

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