fix: fixed slider and classic desktop application

[KevinJaroschewskiCONPORT]

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PR Submission Checklist for internal contributors

What's new in this PR?

Issues

Slider deactivates on mobile after activating it
Add-in is "crashing" on classic outlook desktop after sending the invitation.

Solutions

Fixed the event completion and removed the EventListener from manifest template

How to Test

Create a Meeting Link on Mobile and look at the Wire Slider.
Send a invitation link in outlook classic to check that the outlook add-in does not crash anymore.

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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