Simple change to allow controls that are checkable to also support the Toggle pattern in UIAutomation. This is to support tree items with checkboxes, for which the accessible role is announced as "TreeItem" but need to also support toggle actions.
|For Gerrit Dashboard: QTBUG-81919|
|295041,3||Add "checkable" state to QAccessibleTableCell||5.15||qt/qtbase||Status: MERGED||+2||0|
|295045,3||Windows QPA: Enable Toggle UIA pattern for all checkable controls||5.15||qt/qtbase||Status: MERGED||+2||0|