Add param "external" to avoid calling $scripturl on an already full url fixes #3131
Add param "external"
to avoid calling $scripturl on an already full url
fixes #3131

Signed-off-by: Suki <52329a27ea5670aeec0efeeb0773bf1b4f1affa1@missallsunday.com>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery,margarett/SMF2.1,margarett/SMF2.1