There is a ref=target in the call to render AccessibleButton for
the hide stickers button. This ref is not present in the show case.
When clicking the stickerpicker show button, React gives a warning:
> Warning: Stateless function components cannot be given refs
> (See ref "target" in AccessibleButton created by Stickerpicker).
> Attempts to access this ref will fail.
Removed the ref. Stickerpicker hide/show still works fine, no warning.
Signed-off-by: Jason Robinson <jasonr@matrix.org>
a74cb001b4