Fix orientation extraction from sct_image output

[valosekj]

This PR fixes the failing CI for test_get_orientation:

SCT now adds an extra line with total runtime at the end of its output. Example:

--
Spinal Cord Toolbox (git-jv/sct_process_segmentation_use_hog-2825761400b80fa7d556d24356f78e437c664496*)

sct_image -i /private/var/folders/v3/00vnhxcj5vg7d7mr7r4vl5sr0000gn/T/pytest-of-valosek/pytest-3/test_get_orientation0/BIDS/sub-001/ses-01/anat/sub-001_ses-01_T1w.nii.gz -getorient
--

LPI
Total runtime; 0.150 seconds.

We thus need to strip one extra line to get LPI.

[valosekj]

CI is passing --> merging