AppImageLauncher buttons icons not displayed

[darealshinji]

Pre-submit checks

• [X] I checked for similar issues beforehand, but could not find any, not even closed ones. I could not add my bug report to any existing issue.
• [X] I am going to take the time to to fill in all the required details. I know that the bug report will be dismissed otherwise.

Describe the bug

The icons on all the buttons aren't displayed. Probably an packaging issue?

Expected behavior

Icons should be visible.

Steps to reproduce the issue

No response

Screenshots

Distribution and desktop environment

Ubuntu Mate 23.04

Installed AppImageLauncher version

AppImageLauncher version 2.2.0 (git commit d9d4c73), built on 2022-09-08 14:49:51 UTC

List of AppImages you tried

No response

Additional context

No response