[Suggestion] icon_default should be a related path to prefix

[linsui]

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Describe the bug
I can set the prefix when installing be it's not used in distrobox-generate-entry. The icon path is hardcoded instead.

To Reproduce
Steps to reproduce the behavior

Expected behavior
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Logs
Run the commands with --verbose and post the log here as a file upload
Attach also the output of podman logs or docker logs, possibly with --latest flag

Desktop (please complete the following information):

• Are you using podman or docker?
• Which version or podman or docker?
• Which version of distrobox?

Additional context
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[89luca89]

This is not a bug

Changing to feature suggestion

[89luca89]

This is not planned, in the future it will become part of #386