ufoai fix

[Dan-Simon Myrland <dansimon%radiotube.org@localhost>]

Hi,
I've just compiled games/ufoai on NetBSD 10 RC1 and I noticed that the
launch script in /usr/pkg/bin/ufo has a bug, it says:

cd /usr/pkgsrc/games/ufoai/work/.destdir/usr/pkg/share/ufoai; ./ufo $*;
exit $?

when it's supposed to be:

cd /usr/pkg/share/ufoai; ./ufo $*; exit $?

I looked at the Makefile, but I couldn't figgure out where the bug
lies. Perhaps you will have better luck :)

PS: Keep up the good work!

Best wishes, Dan-Simon Myrland.