sixel: don’t *ever* shrink image below its SRA size
If the image was accompanied with a “Set Raster Attributes” (SRA)
command, make sure we *never* shrink the image below the size
specified in the SRA.
Images are normally shrunk when their bottom rows are fully
transparent. This enables sixels that aren’t a multiple of 6 to be
emitted, without also emitting an SRA command.
But if there *is* an SRA command, obey it.
Verified against XTerm-367
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