push_notifications: Fix incorrect URL being used in bouncer test.
push_notifications: Fix incorrect URL being used in bouncer test.

This was actually testing the validation in the direct push
notifications code path, not the push notification boucner code path.

dhcrzf/zulip,punchagan/zulip,mahim97/zulip,hackerkid/zulip,dhcrzf/zulip,synicalsyntax/zulip,brainwane/zulip,punchagan/zulip,rht/zulip,verma-varsha/zulip,andersk/zulip,kou/zulip,jackrzhang/zulip,mahim97/zulip,brainwane/zulip,shubhamdhama/zulip,Galexrt/zulip,tommyip/zulip,zulip/zulip,brockwhittaker/zulip,synicalsyntax/zulip,jackrzhang/zulip,mahim97/zulip,vaidap/zulip,eeshangarg/zulip,brainwane/zulip,tommyip/zulip,Galexrt/zulip,zulip/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,shubhamdhama/zulip,shubhamdhama/zulip,amanharitsh123/zulip,rht/zulip,showell/zulip,eeshangarg/zulip,eeshangarg/zulip,vaidap/zulip,rishig/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,showell/zulip,punchagan/zulip,eeshangarg/zulip,synicalsyntax/zulip,kou/zulip,andersk/zulip,rishig/zulip,mahim97/zulip,kou/zulip,kou/zulip,kou/zulip,verma-varsha/zulip,tommyip/zulip,jackrzhang/zulip,eeshangarg/zulip,jackrzhang/zulip,timabbott/zulip,synicalsyntax/zulip,showell/zulip,mahim97/zulip,rishig/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,rht/zulip,brockwhittaker/zulip,vaidap/zulip,jackrzhang/zulip,rht/zulip,amanharitsh123/zulip,timabbott/zulip,zulip/zulip,hackerkid/zulip,showell/zulip,timabbott/zulip,rishig/zulip,amanharitsh123/zulip,brainwane/zulip,tommyip/zulip,zulip/zulip,timabbott/zulip,andersk/zulip,verma-varsha/zulip,Galexrt/zulip,vaidap/zulip,verma-varsha/zulip,brockwhittaker/zulip,synicalsyntax/zulip,rht/zulip,Galexrt/zulip,Galexrt/zulip,brainwane/zulip,jackrzhang/zulip,kou/zulip,zulip/zulip,timabbott/zulip,tommyip/zulip,vaidap/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,amanharitsh123/zulip,dhcrzf/zulip,showell/zulip,Galexrt/zulip,verma-varsha/zulip,andersk/zulip,punchagan/zulip,amanharitsh123/zulip,shubhamdhama/zulip,dhcrzf/zulip,rishig/zulip,brockwhittaker/zulip,vaidap/zulip,amanharitsh123/zulip,shubhamdhama/zulip,dhcrzf/zulip,andersk/zulip,rishig/zulip,punchagan/zulip,brainwane/zulip,timabbott/zulip,hackerkid/zulip,hackerkid/zulip,rishig/zulip,Galexrt/zulip,hackerkid/zulip,synicalsyntax/zulip,verma-varsha/zulip,synicalsyntax/zulip,brainwane/zulip,timabbott/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,brockwhittaker/zulip,showell/zulip,rht/zulip,kou/zulip,dhcrzf/zulip,zulip/zulip,mahim97/zulip,tommyip/zulip,brockwhittaker/zulip,hackerkid/zulip