[sfm] fix : `sfmDataIO_json` bad keys for `featuresFolders` and `matchesFolders`
[sfm] fix : `sfmDataIO_json` bad keys for `featuresFolders` and `matchesFolders`

poparteu/openMVG,poparteu/openMVG,poparteu/openMVG,poparteu/openMVG