package-all.sh: Don't use parameter expansion for paths

[Unrud]

cd "${0%/*}" fails when the script is started with bash package-all.sh because $0 is package-all.sh in this case.

[anvilvapre]

Seems OK, only that in launch-game.sh a more robust solution is already used:

LAUNCHPATH=$(python3 -c 'import os,sys; print(os.path.realpath(sys.argv[1]))' "$0")

(realpath is not available on MacOS)

[Unrud]

only that in launch-game.sh a more robust solution is already used:

The path is only used for cd. I see no reason for the use of realpath here.

[Mailaender]

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