Revert "change absolute file path in pycrazyswarm"

[shupx]

Reverts USC-ACTLab/crazyswarm#716 As discussed in https://github.com/USC-ACTLab/crazyswarm/pull/716#issuecomment-1355336638, the change of the absolute path of "crazyflies.yaml" may conflict with the howto instructions in https://crazyswarm.readthedocs.io/en/latest/howto/howto.html#option-2-custom-ros-package. Sorry that I didn't notice this problem and thanks https://github.com/USC-ACTLab/crazyswarm/pull/716#issuecomment-1355336638 for pointing it out. I would recommend reverting this change to keep consistent with the instruction document.

[whoenig]

Thanks - sorry that I didn't catch the issue either.