Scripts/Feralas: Make Screecher Spirit disappear after clicking on them

This is a temporary solution, the script should be rewritten in SAI

Closes #12298

Signed-off-by: DDuarte <dnpd.dd@gmail.com>
Scripts/WesternPlaguelands: Fix conditions to show gossip of Myranda the Hag (In Dreams quest)

Ref #7519

Signed-off-by: DDuarte <dnpd.dd@gmail.com>