Adds tooltip for compose menu

[byteplow]

Adds tooltip New conversation to Compose Menu Button In Room List Header.

Checklist

• I have read through review guidelines and CONTRIBUTING.md.
• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• I have licensed the changes to Element by completing the Contributor License Agreement (CLA)

[florianduros]

@byteplow the PR has lint errors, you can run yarn lint to list them.

[kaylendog]

LGTM from a crypto perspective, since there's no crypto here!

[byteplow]

Not sure about the jest test fail. <MatrixChat /> › with an existing session › onAction() › room actions › leave_room › for a room › should do nothing on cancel dose not fail locally. And i see no connection to my change.

[robintown]

Indeed the test failure went away on a re-run. Thanks for the improvement, and sorry for my delay in rechecking this!