CMETA Reader Typo

[elwell67]

Simple typo in Line 177 of io.general.nitf_elements.tres.unclass.CMETAA.py

"PATH" should be "PATCH" in the middle line.

self.add_field('CG_PATCH_LTCORLL', 's', 11, value)
self.add_field('CG_PATH_LNGCOLL', 's', 12, value)
self.add_field('CG_PATCH_LAT_CONFIDENCE', 's', 9, value)

Thanks!