qt/messages: fix lack of focus border on button
The update/clear icon-based button here gives no indication that it has the focus if you tab to it via keyboard navigation. Switching the button type from `QPushButton` to `QToolButton` fixes this. Note that the similar button in the sync tab of the effects dialog is of type `QToolButton` and did not exhibit the problem. (Non-functional change; no other change in appearance).
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