upgrade-zulip-from-git: Fix upstream URL for existing deploys.
upgrade-zulip-from-git: Fix upstream URL for existing deploys.

zulip/zulip,rht/zulip,andersk/zulip,rht/zulip,andersk/zulip,kou/zulip,zulip/zulip,kou/zulip,kou/zulip,zulip/zulip,andersk/zulip,kou/zulip,kou/zulip,zulip/zulip,kou/zulip,rht/zulip,andersk/zulip,andersk/zulip,andersk/zulip,andersk/zulip,zulip/zulip,kou/zulip,zulip/zulip,rht/zulip,rht/zulip,rht/zulip,zulip/zulip,rht/zulip