ACC-226 [iOS] Apply new colors in Conversations List

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PR Submission Checklist for internal contributors

• The PR Title
  • [x] conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • [x] contains a reference JIRA issue number like SQPIT-764
  • [x] answers the question: If merged, this PR will: ... ³

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What's new in this PR?

Apply new color (without changing UI of elements) for the conversation list.

Issues

Solutions

Apply fimga design for the elements to change it's appearance (color).

Testing

Test Coverage (Optional)

• [x] I have added automated test to this contribution

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PR Post Submission Checklist for internal contributors (Optional)

• [x] Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• [ ] If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

Codecov Report

Merging #5792 (af861fd) into develop (eef9dc1) will decrease coverage by 0.00%. The diff coverage is 86.81%.

@@             Coverage Diff             @@
##           develop    #5792      +/-   ##
===========================================
- Coverage    60.47%   60.47%   -0.01%     
===========================================
  Files         1020     1020              
  Lines        56658    56683      +25     
  Branches     23551    23546       -5     
===========================================
+ Hits         34262    34277      +15     
- Misses       22023    22033      +10     
  Partials       373      373