fix(index): remove invalid keyword argument

It was a left-over of some prior hacking that was not removed by
accident.

Author: Byron

git/index/base.py

@@ -610,7 +610,7 @@ def _entries_for_paths(self, paths, path_rewriter, fprogress, entries):
 
                 blob = Blob(self.repo, Blob.NULL_BIN_SHA,
                             stat_mode_to_index_mode(os.stat(abspath).st_mode),
-                            to_native_path_linux(gitrelative_path), encoding=defenc)
+                            to_native_path_linux(gitrelative_path))
                 # TODO: variable undefined
                 entries.append(BaseIndexEntry.from_blob(blob))
             # END for each path