puppeteer: Replace `hidden: false` with `visible: true`.
puppeteer: Replace `hidden: false` with `visible: true`.

I had a misconception with hidden and visible options
and thought `hidden: false` was same as `visible: true`
and other way too.

But `hidden: false` or `visible: false` does nothing
more than checking if the selector exists.

Also, to mention, `visible: false`'s were fixed in
33e19fa7d19ddb201f95c0ee8be34203d9848475

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