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[test_runner] Fix unidash option for junit output to be one character

Description

[test_runner] Fix unidash option for junit output to be one character

Summary: > -ju is absolutely non standard. unidashed parameter are uni letters, contrary to double dashed ones.

Test Plan: Harbormaster build will be green

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D3692