submit50 uses numeric user ID instead of login string

[PetersonCodeDev]

git clone ... https://259196269@github.com/me50/259196269

Environment

• OS: Lubuntu (Linux)
• Python: 3.12 (via virtualenv cs50-env)
• submit50 version: latest
• lib50 version: 3.0.x

Bug

submit50 authenticates successfully but then tries to clone
from me50/259196269 (numeric GitHub user ID) instead of
me50/PetersonCodeDev (login string). The repository
me50/259196269 does not exist, causing the
git clone --bare --single-branch https://259196269@github.com/me50/259196269
fatal: repository 'https://github.com/me50/259196269/' not found

Expected behavior

Should clone from me50/PetersonCodeDev, not me50/259196269.

Workaround

Using check50 --local which works correctly (8/8 tests passing).