UI: Add cleanup of stats callback on window close

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Moving the cleanup to OBS_FRONTEND_EVENT_EXIT in #8735 only handled the
cleanup from the dockable window, as the regular stats window is deleted
on close when the UI is shut down. This caused an event handler leak
each time the window is manually closed, resulting in crashes. This code
looks a bit wrong since we delete the same handler in multiple places,
but this is due to the code being used by both the dock (non-closable)
and the window (closable). The OBS_FRONTEND_EVENT_EXIT handler handles
cleanup from the dockable stats window, and the window close handler now
handles cleanup from the non-dockable stats window.

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