sixel: fix cursor positioning logic
This adjusts the logic that positions the text cursor after emitting a
sixel, when sixel scrolling mode is *enabled*.
We’ve always mimicked XTerm’s behavior. However, XTerm recently
changed its behavior, to better match that of an VT382.
Now, the cursor is placed *on* the last row of the sixel, instead of
on a new row after the sixel.
This allows applications to print sixels to the bottom row of the
terminal, without causing the content to scroll.
Finally, there was a bug in the horizontal positioning of the cursor;
it was placed on the *first* column of the row, instead of on the
first column of the sixel.
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