Fix group injection fro printers

[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 !46346
• Here is a brief description of what this PR does

The “Group” field did not appear in the printer mapping because its search option did not have a defined linkfield, which made it non-injectable. Added $tab[71][‘linkfield’] = ‘groups_id_normal’;, as had already been done for computers.

Screenshots (if appropriate):