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MINOR: [Go] Use proper methods in compute (#35976)

Blocks #35973
@ zeroshade I believe this is a proper code (use Item instead of Value for map type).
I'll leave the filling in & the issue creation up to you.

### Rationale for this change

### What changes are included in this PR?

### Are these changes tested?

### Are there any user-facing changes?

Lead-authored-by: candiduslynx <candiduslynx@gmail.com>
Co-authored-by: Alex Shcherbakov <candiduslynx@users.noreply.github.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>