rio: get rid of window delete thread, fix mysterious disappearing windows

because a client might not handle resize, rio would try to move ther
window offsceen after 750 ms. however, it does this by window name,
which could have been reassigned by another concurrent rio, causing the
wrong window to disappear.

now we always move the window offscreen before freeimage(). this way we
are sure to still have the right reference to the original window.

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