cli: remove duplicate wallet fields from -getinfo

Summary:
These lines are duplicated.

Backport of Core PR15564

Test Plan: `ninja && ninja check-functional`

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7735