chore(xo-web/backup-ng): timeout is in hours

[Enishowk]

Fixes #3550

Check list

Check items when done or if not relevant

• PR reference the relevant issue (e.g. Fixes #007)
• if UI changes, a screenshot has been added to the PR
• CHANGELOG:
  • enhancement/bug fix entry added
  • list of packages to release updated (${name} v${new version})
• documentation updated

Process

1. create a PR as soon as possible
2. mark it as WiP: (Work in Progress) if not ready to be merged
3. when you want a review, add a reviewer
4. if necessary, update your PR, and re- add a reviewer

Screenshot

[julien-f]

Please add a small screenshot to the UI change 🙂

[Enishowk]

Please add a small screenshot to the UI change 🙂

And it's done. ;)

[julien-f]

There is an issue in PR, the UI indeed marks the timeout as being in hours but it's still in seconds, we need to correctly transform the value as well.

I'm creating a PR for it.