PKGget fix bug when uninstall PET

Caramel found a bug when uninstalling a PET package:

https://forum.puppylinux.com/viewtopic.php?p=166938#p166938

Yes, the problem is in /usr/local/petget/removepreview.sh script. It thinks that the PET is actually a Devuan DEB package, then tries to use 'apt' to uninstall. Fixed.

Caramel also found a bug in /usr/local/petget/installpkg.sh script. Yes, /etc/inittab has changed. That block of code in installpkg.sh is no longer required, have removed it.      

Tags: easy