Package uninstall fixes

Caramel has been performing some install and uninstall tests in easyVoid:

https://forum.puppylinux.com/viewtopic.php?p=113691#p113691

Yes, there are some issues; folders and icons getting left behind after a package is uninstalled. These issues apply to all Easy* variants. I have applied some fixes:

/usr/local/petget/removepreview.sh:

https://github.com/bkauler/woofq/commit/b28a64b591ad0647e1e2bc2cc30629330262f868

/usr/bin/xbps-remove.sh:

https://github.com/bkauler/woofq/commit/7ddf41bbd34fa72ed2be6e313d3fa5a186bdc08e

One issue was that you might create an icon on the desktop for an application, but after uninstalling the application, the desktop icon is still there. Sure, you can manually delete it, but now it is likely to get deleted automatically.   

Tags: easy