puppeteer: Wait for display settings section to appear before clicking.
puppeteer: Wait for display settings section to appear before clicking.

In few rare cases the click on display settings section wasn't working
which was causing the test to stay in the "your account" settings section.
This lead to a waitFor fail.

The screenshot in this failed CircleCI build suggests the above.
https://app.circleci.com/pipelines/github/chdinesh1089/zulip/525/workflows/cd77e269-6a3e-4283-b765-d1c4584ccf35/jobs/1807/artifacts

This and the previous commit along with the changes to prevent
logging out of user on changing password were tested by running
this test 1200 times and all of them passed!

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