g.extension: no need to delete tmp files (see https://trac.osgeo.org/grass/changeset/49440)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@49441 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/g.extension/g.extension.py

@@ -363,7 +363,6 @@ def install_extension_win():
                 outfile.close()
         
         fo.close()
-        grass.try_remove(fo)
     except HTTPError:
         grass.fatal(_("GRASS Addons <%s> not found") % options['extension'])