fix: deleted defaultSubjectValue

[KevinJaroschewskiCONPORT]

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PR Submission Checklist for internal contributors

What's new in this PR?

Issues

"New Appointment" overwrites the "CLDR::" Prefix on empty conversation titles

Solutions

Deleted defaultSubjectValue = "New Appointment";

Testing

How to Test

Create a meeting without a title, and check for the CLDR:: "Current Date" conversation Title in Wire

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.

[CLAassistant]

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