gh-102778: revert changes to idlelib

[iritkatriel]

See #102779 (comment).

• Issue: Add sys.last_exc, deprecate sys.last_type, sys.last_value and sys.last_traceback #102778

[terryjreedy]

Thank you. Laying in bed, I realized that I could easily do this by copying the 4 files from installed 3.12.0b6 into my local clone. Did you do something similar or did you edit the diff and use a git command I am not aware of?

[iritkatriel]

I did something similarly low-tech.