Fix/shmiadzu correction few images plot
Description
When the correct_images are less than 5 the subplots return an ax array which has smaller dimension than expected.
It would be optimal to fix it from the main code with https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.subplots.html squeeze=False flag as @kluyvert pointed.
This is a fix for this issue which was realized in the DOC while some SPB runs where being corrected.
https://git.xfel.eu/calibration/pycalibration/-/issues/107
This is HOTFIXED in production.