chore: lean.code-workspace: fix terminal cwd

[Kha]

No description provided.

[Kha]

My previous testing seems to have worked only accidentally because I must have been testing it in the root dir itself, but this appears to be working from within any workspace folder

[leanprover-community-bot]

Mathlib CI status (docs):

• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 114f7e42f1abd10885e91698cd2910b1e4d76083 --onto 14ff08db6f651775ead432d367b6b083878bb0f9. You can force Mathlib CI using the force-mathlib-ci label. (2025-10-16 09:52:40)

[leanprover-bot]

Reference manual CI status:

• ❗ Reference manual CI will not be attempted unless your PR branches off the nightly-with-manual branch. Try git rebase 114f7e42f1abd10885e91698cd2910b1e4d76083 --onto d3dda9f6d4428a906c096067ecb75e432afc4615. You can force reference manual CI using the force-manual-ci label. (2025-10-16 09:52:42)