CC-2137: use name instead of path (#174)

Micky Vale was still getting errors on UAT when she tried to create a
new Gloss.
This should hopefully fix this.

## JIRA Ticket
[CC-2137 NZSL: move signbank to
Poetry](https://ackama.atlassian.net/browse/CC-2137)

## Changes
- `GlossVideo` method `rename_video()` uses `name` instead of `path`
from `storage`, see Notes below

## Notes
- A Stack Overflow that describes the `path` / `name` issue:
https://stackoverflow.com/a/69135593

signbank/video/models.py

@@ -197,7 +197,7 @@ def rename_video(self):
                 # Set the actual file path to videofile.
                 self.videofile = saved_file_path
 
-                old_file.storage.delete(old_file.path)
+                old_file.storage.delete(old_file.name)
 
     def create_filename(self):
         """Returns a correctly named filename"""