sixel: also set 'alloc_height', when short-cutting a resize operation
In some cases, a sixel may be resized vertically, while still having a
zero-width. In this case, the resize operations are short-cutted, and
no actual allocations are done.
However, we forgot to set 'alloc_height' when doing so. As a result,
the trimming code (when the sixel is "done"), trimmed away the entire
sixel.
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