setup.sh for unknown distros is (partially) broken

[chemmi]

The setup.sh for unknown distros (like kali) is partially broken.
This is due to the fact that it exits too early.
The relevant part is:

pwndbg/setup.sh

Lines 62 to 70 in ab46a79

	echo "\"$distro\" is not supported distro. Will search for 'apt' or 'dnf' package managers."
	if hash apt; then
	install_apt
	elif hash dnf; then
	install_dnf
	else
	echo "\"$distro\" is not supported and your distro don't have apt or dnf that we support currently."
	fi
	exit

This can be fixed by moving =exit= into the else-branch.
One may use =exit 1= instead.

[disconnect3d]

@chemmi oh, thanks for catching this. Gonna fix it now o/