Fix reset TP
Il faut fixer cette erreur lors du reset d'un TP par rapport à git.
Internal Server Error: /practical-work/16/reset_groups/
GitCommandError at /practical-work/16/reset_groups/
Cmd('git') failed due to: exit code(1)
cmdline: git checkout master
stderr: 'error: Your local changes to the following files would be overwritten by checkout:
xxx/progress.json
xxx/src/file_de_priorite.py
zzz/progress.json
zzz/src/file_de_priorite.py
Please commit your changes or stash them before you switch branches.
Aborting'