Fix Maximum consumable quantity tooltip value

[Lainow]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes Cannot charge new tickets with Credit plugin after migrating from GLPI 9.5 to 11 (quantities display correctly but consumable quantity stays 0, even for unlimited credit #204
• Here is a brief description of what this PR does

Screenshots (if appropriate):

[Rom1-B]

Suggested change