OPT: correction of the crop_over_square_mask function
OPT: correction of the crop_over_square_mask function

Former-commit-id: 7e997a1111a5afdc09ae9722793105f29aeab383 [formerly fd9d701d2ab73bac0d647f3f0636f9714bf10d0a]
Former-commit-id: 6187322fae6549f6b805e5450a84c02a3fa35de6
Former-commit-id: 52f77f7eb26b8ff840736a665748539aaa80ccbc
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox