emulators/playonbsd: Fix pkg-plist

Unbreak build by fixing pkg-plist:

pkg-static: Unable to access file /wrkdirs/usr/ports/emulators/playonbsd/work/stage/usr/local/lib/playonbsd/python/__pycache__/debug.cpython-311.pyc:No such file or directory

See also: https://portsfallout.com/port/33842/
Approved by: portmgr (blanket)
MFH: 2024Q4