OPT: remove duplicated file extension
OPT: remove duplicated file extension

Former-commit-id: d511b0f4c81715cdd996c46fccd83aa10276451f [formerly f4c508d3a8e5870cd4fd140378ae4230861d32d0]
Former-commit-id: bbc0a2a94ff0706ccba51060e7763dd59073dde9
Former-commit-id: c817c9832e6b831280665add5e14137764221b8a
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox