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55414: Restore copied bitmap data from top to bottom of region to scroll
Used by the routine at 55470.
B Width of region to scroll (characters)
HL Points to bottom pixel row (left-most character) of region to scroll
55414 LD DE,23296 Point DE at copied bitmap data at 23296
55417 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)
55418 LDIR Copy previously stored bitmap data into bottom pixel row of region to scroll
55420 RET Return
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