[patch] fix pygame detection in games/jools

I can't get the new port "jools" to detect my installation
of pygame, no doubt due to some path confusion. Don't know
if it's just this machine, but I will note that I basically
have a default Python install from ports, with a few
additional modules, but no PYTHONPATH or anything about
python in make.conf. (Perhaps the original porter has
site-packages/pygame in his default path?)

PR: ports/53020
Submitted by: Mark Linimon <linimon@lonesome.com>