Extend "restart required" dialog to Windows

[nicholas-wilson-au]

Pre-submission Checks

• [X] I checked for similar issues, but could not find any. I also checked the closed issues. I could not contribute additional information to any existing issue.
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Describe the bug

I am getting an ownCloud notification when I log in to my PC that there is an update available and that I should restart the client to start the update. However, restarting the client nor restarting the PC results in the update starting.

Expected behavior

I expect that after closing the program, I should get a UAC request in windows to allow the updater to run.

Steps to reproduce the issue

Start the owncloud client. Get the pop up. right click on the owncloud client taskbar tray icon and select quit owncloud. Wait.

Screenshots

https://cloud.owncloud.com/s/mFEXiz1bCBku780

Logs

https://cloud.owncloud.com/s/k4hSM1oadCTx8K0

Client version number

4.0.10896

Desktop environment (Linux only)

No response

Client package version and origin (Linux only)

No response

Installation path (Windows only)

c:\program files\owncloud\owncloud.exe

Server information

cloud.owncloud.com

Additional context

For reference, while collecting the system information and unrelated program, Notepad++, showed an upgrade was available and its behavior was as expected.