http: allow short response byte range
RFC9110 specifies that a client must handle a shorter response range than requested in all circumstanges. Previously, RFC7233 only required that behaviour for multipart ranges, which VLC did not use.
This matches the newer specification: VLC will try to resume from the last received offset not only on unexpected error, but also on short response.
Fixes #28627 (closed).
(cherry picked from commit 90dc0a02)