`apps:rename` removes the git remote instead of renaming it

[justinwilaby]

v9.5.x and earlier

running heroku apps:rename -a OLD_NAME NEW_NAME in a directory where a git remote exists for OLD_NAME causes it to be removed from the remotes instead of renamed.

Repro steps

1. Add an app to the git remotes heroku git:remote APP_NAME
2. Verify the heroku remote exists git remote -v
3. Rename the app heroku apps:rename -a OLD_NAME NEW_NAME
4. Verify the heroku remote was updated git remote -v

Expected behavior

The heroku remote is updated with the new app name

Actual behavior

The heroku remote is removed