Fix incorrect nginx rewrite rule for stream in HA controller example
Fix incorrect nginx rewrite rule for stream in HA controller example

Fixes #4665

Plexxi/st2,Plexxi/st2,Plexxi/st2,Plexxi/st2,nzlosh/st2,nzlosh/st2,StackStorm/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,nzlosh/st2,StackStorm/st2