[Bug]: Nextcloud uninstall not removing startup registry key

### ⚠️ 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've searched 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

When uninstalling Nextcloud, the "Run" registry key is maintained causing an error every time Windows boots as it tries to launch an application that is no longer installed.

Solution: Makes sure uninstaller removes any registry key creating by Nextcloud.

Minimal fix: Uninstaller should remove registry key (if present): HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\Nextcloud

### Steps to reproduce

1. Right click on the file
2. Click on Share Options
3. The share dialog does not display the option to share by e-mail
...

### Expected behavior

When clicking on the share dialog, share by e-mail should be an option.
...

### Which files are affected by this bug

Nextcloud uninstaller

### Operating system

Windows

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

Windows 11

### Package

Official Windows MSI

### Nextcloud Server version

latest

### Nextcloud Desktop Client version

33.0.2.9707

### Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.16.1 to 3.16.2)

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

Encryption is Enabled

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

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

### Nextcloud Server logs

```shell

```

### Additional info

_No response_