Revert "OPT: do not output qc when registering images with sct_segment_gm code"
Revert "OPT: do not output qc when registering images with sct_segment_gm code"

This reverts commit 0d7d6d6073ebd292c1543a148fd591cea9023f32.

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox