The end of the byte range is the first byte that is NOT part of the to
be downloaded range. So don't include it into the requested HTTP
download range, as this additional byte leads to a broken TS packet and
subsequently to e.g. visible video corruption.
Fixes#14748.
According to [1] TABs must be used as separators between fields.
Files produces by some tools with spaces as separators are considered
malformed.
1. https://curl.haxx.se/docs/http-cookies.html
This reverts commit cff99c91d1.