Invite link in email opens Element in a browser instead of app

### Steps to reproduce

1. Receive invite by email (to an unregistered email address)
2. Click link in the Mail app

### What happened?

### What did you expect?
Element app opens or something prompting me to install it (in my case, I had two versions of it installed, Element from the app store and Gil's build)

### What happened?
Safari opened and showed me the spare preview

### Your phone model

_No response_

### Operating system version

14.6

### Application version

App store + Gil's build

### Homeserver

_No response_

### Have you submitted a rageshake?

No

Start by reproducing the invite-link flow from Mail on iOS 14.6 with the App Store app and Gil's build installed, then compare how the link is handled by Safari and Element. Done means the invite link opens Element or presents an appropriate installation prompt instead of showing the spare preview in Safari.

Written by the indexing model from the issue text.