Windows client installation always adds desktop icon - no way to turn it off

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I have searched for it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

As described: Installing the Windows Nextcloud client adds a desktop icon, unasked. This also affects each single update. I consider this to be a bug, as it requires manual interaction after each install/update.

### Steps to reproduce

- Install Nextcloud on Windows
- Check your desktop
- Nextcloud icon added

On Updates:
- Remove Nextcloud desktop icon
- Update Nextcloud
- Icon is added again

### Expected behavior

Having app icons on the desktop stems from reasons in the past of Windows, and it is a user specific preference - I do not want or need it. Nextcloud starts by itself, there's usually no reason to start it manually from the desktop.

Recommendation:
- Make adding a desktop icon an install-time preference, which is also offered on updates - e.g. in form of a checkbox
- Remember the user's selection on Nextcloud client updates, uncheck it if the user unchecked it with the last install/update

### Which files are affected by this bug

Desktop icon (there is no specific file affected)

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11

### Installation method

Official Windows MSI

### Nextcloud Server version

33.0.8

### Nextcloud Desktop Client version

34.0.3

### Did this occur after an update or on a clean installation?

Minor version update (i.e. 33.0.0 → 33.0.1)

### Are you using the Nextcloud Server Encryption module?

Yes

### Are you using an external user-backend?

- [ ] Default internal user-backend
- [ ] LDAP or Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell

```

### Additional info

_No response_

Start with the official Windows MSI installation and update flow described in the report, focusing on where the desktop icon is created. Done means installation and updates offer a persistent opt-out, and the icon is not recreated when the user has declined it.

Written by the indexing model from the issue text.