integrations: Fix JavaScript exception on category pages.
integrations: Fix JavaScript exception on category pages.

This logic threw an exception ever since we added new buttons at the
bottom of the page that were inside the container this looped over.

kou/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,punchagan/zulip,kou/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,hackerkid/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,punchagan/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,rht/zulip,zulip/zulip,kou/zulip,kou/zulip,zulip/zulip,kou/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,kou/zulip