show MediaSettings if coming from notification "Join call"

[Antreesy]

☑️ Resolves

• Fix 📲 Add controller URL which opens directly the call/device checker #7038

🖌️ UI Checklist

No visual changes

• With opening from web client - redirect to the page, media settings dialog is shown
• With opening from NC Desktop client - open new page in browser, media settings dialog is shown

🚧 Tasks

• Talk Desktop - test with
• Don't show previews for specific conversations:
  • BrowserStorage should be available atm
  • Or we force the dialog

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

---

🛠️ API Checklist

🚧 Tasks

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not possible
• 📘 API documentation in docs/ has been updated or is not required
• 🔖 Capability is added or not needed

[nickvergessen]

Fixed eslint and pushed the backend. Works great!

[Antreesy]

Button Join call leads to correct link:

But Answer call does not:

Should be fixed on Desktop client side though, it is edited manually, iirc

[Antreesy]

Talk Desktop Client uses notification link when it shows a native system notification, not notification action link:

As root link should not be modified (Desktop may use it to reply in chat), Talk Desktop can use a link from actions[0], if it exists