net-p2p/transmission-components: Get transmission-web back

After the reorganization of the port in ac3e39992e95659a5193a15d4cb873efb00fcb30
the web interface was only available if the daemon component was selected.
This is not right since the gtk version of transmission needs those files too,
otherwise the setup is broken.

Bring transmission-web option back.

PR: 279214
Reported by: fernape@FreeBSD.org