term: sixel sizing & output fixes

* round down to number divisible by 6 for height
* make pager's dispw match term's dispw even after width clamping
* make *BE procs actually emit/consume big-endian (lol)
* fix borked sixel set raster attributes & control string

I mixed up SRA with the device control string's parameters, so instead
of toggling transparency in the DCS, I was setting the second SRA
parameter to 0. Which, by the way, defines the aspect ratio's
denominator, and has nothing to do with transparency. Whoops.

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