chore(csp): cleanup default CSP values (SQCORE-527)

[comawill]

SQCORE-527 Improve CSP on *.wire.com pages

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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

  • [ ] 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?

Issues

The default CSP configuration contains several unnecessary entries, probably required in previous releases.

Solutions

Remove all CSP entries, that are no longer required.

Testing

How to Test

These changes should not break anything, but if they do they should be observervable by automated CI tests. Potentially affected:

• initial account creation (profile picture creation)
• display of profile pictures
• youtube/soundcloud/spotify/vimeo integration

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PR Post Submission Checklist for internal contributors (Optional)

• [ ] 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[bot]]

Codecov Report

Merging #13427 (5a093b4) into dev (94c91c2) will not change coverage. The diff coverage is n/a.

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##              dev   #13427   +/-   ##
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  Coverage   39.08%   39.08%           
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  Files         568      568           
  Lines       21042    21042           
  Branches     4544     4544           
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  Hits         8225     8225           
  Misses      11834    11834           
  Partials      983      983