IC-56 The color of the ChangeHandleViewController is transparent instead of black

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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

• The PR Description

  • [x] is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

With this PR we fix the color of the navigation bar from transparent to black.

BEFORE	AFTER

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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.

Code looks good to me 👍

Codecov Report

Merging #5697 (70dae8c) into develop (7d4aba4) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #5697   +/-   ##
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  Coverage    60.50%   60.51%           
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  Files         1019     1019           
  Lines        56715    56716    +1     
  Branches     23577    23577           
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+ Hits         34318    34324    +6     
+ Misses       22025    22020    -5     
  Partials       372      372