Error with .desktop file for Linux

[chris9740]

• This is not a feature request (existing functionality does not work, not missing functionality).
  I will request features on forum or via support.
• I've searched and did not find a similar issue.

Describe the bug
The Icon key inside the .desktop file for Linux is invalid. The value is currently tutanota-desktop.png, but as per the Icon Theme Specification, it should not contain a file extension if it's not an absolute path. This causes the icon to not load.

Link to offending line of code

To Reproduce
Steps to reproduce the behavior:

1. Install Tutanota
2. Open the "quick launcher" (WIN key)
3. Search Tutanota
4. The result should show the Tutanota application with a placeholder icon

You can also run desktop-file-validate ~/.local/share/applications/tutanota-desktop.desktop, which should error with:

error: (will be fatal in the future): value "tutanota-desktop.png" for key "Icon" in group "Desktop Entry" is an icon name with an extension, but there should be no extension as described in the Icon Theme Specification if the value is not an absolute path

Expected behavior
The icon should load.

Screenshots

Desktop (please complete the following information):

• OS: Pop!_OS 22.04 LTS
• Desktop Environment: gnome
• Version: v3.119.10

Additional context
I tried simply removing the .png from the .desktop file and it resolves the issues

Test Notes

• Running desktop-file-validate on the clients .desktop passes without any errors or warnings
• The icon still appears under
  • GNOME
  • KDE