skip thumbnails with only one nonzero dimension in all_file_metadata

Previously we were only skipping thumbnails that had both dimensions
nonzero. I think the assumption was that only the dimensions allowed by
services::media::thumbnail_properties would be used. This is not the
case because we have used arbitrary thumbnail dimensions when requesting
remote thumbnails.

src/database/key_value/media.rs

@@ -208,7 +208,7 @@ impl service::media::Data for KeyValueDatabase {
                     let key = MediaFileKey::new(key);
 
                     let parts = MediaFileKeyParts::try_from(&key)?;
-                    if parts.width != 0 && parts.height != 0 {
+                    if parts.width != 0 || parts.height != 0 {
                         // Skip thumbnails
                         return Ok(None);
                     };