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55448: Restore copied bitmap data from bottom to top of region to scroll
Used by the routine at 55559.
B Width of region to scroll (characters)
HL Points to top pixel row (left-most character) of region to scroll
55448 LD DE,23296 Point DE at copied bitmap data at 23296
55451 EX DE,HL Swap DE (now points to bottom pixel row in region to scroll) and HL (now points to copied bitmap data at 23296)
55452 LDIR Copy previously stored bitmap data into bottom pixel row of region to scroll
55454 RET Return
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