[Sora][Message] The "slecet all/deselect all"still can use when it display as grey.

why not, but I wonder why we set `pointer-events: none` in buttons.css in the first place in https://github.com/mozilla-b2g/gaia/blob/379ac0e17cd5915e48a0c3e4af3426f56a43c15a/shared/style/buttons.css#L88 (and the following rules too) ?

That said if we're afraid of regression, I would be fine with this patch, but I'd like an answer with this question first.