Fix sprite plotting with SpriteExtend 1.43 and later.
In numerous places where a sprite area isn't strictly necessary !Draw was passing in a bogus area address of 0xFF, this is now rejected by SpriteExtend. Changed to use define UNUSED_SA and set this to an address which is at least in the application slot and word aligned. Tested briefly - sprites now appear again. Version 1.19. Tagged as 'Draw-1_19'
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