backend: remove unused Location method

internal/backend/s3/s3.go

@@ -321,11 +321,6 @@ func (be *Backend) Connections() uint {
 	return be.cfg.Connections
 }
 
-// Location returns this backend's location (the bucket name).
-func (be *Backend) Location() string {
-	return be.Join(be.cfg.Bucket, be.cfg.Prefix)
-}
-
 // Hasher may return a hash function for calculating a content hash for the backend
 func (be *Backend) Hasher() hash.Hash {
 	return nil