file size support set file length

use Attr.FileSize and TotalChunkSize to determine file size

weed/s3api/s3api_objects_list_handlers.go

@@ -141,7 +141,7 @@ func (s3a *S3ApiServer) listFilerEntries(bucket string, originalPrefix string, m
 					Key:          fmt.Sprintf("%s%s", dir[len(bucketPrefix):], entry.Name),
 					LastModified: time.Unix(entry.Attributes.Mtime, 0).UTC(),
 					ETag:         "\"" + filer2.ETag(entry) + "\"",
-					Size:         int64(filer2.TotalSize(entry.Chunks)),
+					Size:         int64(filer2.FileSize(entry)),
 					Owner: CanonicalUser{
 						ID:          fmt.Sprintf("%x", entry.Attributes.Uid),
 						DisplayName: entry.Attributes.UserName,