Update downloads .tar.gz rather than .deb

[edent]

Describe the bug

VSCodium Alerted me to an update. Clicking the update button downloaded the .tar.gz version of the latest release. It should have downloaded the .deb

Please confirm that this problem is VSCodium-specific

• This bug doesn't happen if I use Microsoft's Visual Studio Code. It only happens in VSCodium.

Please confirm that the issue/resolution isn't already documented

• I checked the Docs page and my issue is not mentioned there.

To Reproduce
Steps to reproduce the behavior:

1. Install an older version using the .deb installer
2. Click on Update
3. The .tar.gz is downloaded
4. User gets confused and is unable to apply the update

Expected behavior
If the app has been installed from a .deb, it should download an updated .deb. If the app was installed using an .rpm file, that filetype should be downloaded.

Desktop (please complete the following information):

• OS: Ubuntu 20.04,
• Architecture: x64
• Version: 1.75
• App Manager: N/A
• Sandboxed: N/A

[daiyam]

It will be fixed with #1449. But there is no way to know which package to download, so it's going to like VSCode, a redirect to the download page.