HARP-15031 Move boxes up by half the height to ensure that they sit on top of the buildings

[nzjony]

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[codecov]

Codecov Report

Merging #2188 (31f2dc7) into master (b63d78e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2188   +/-   ##
=======================================
  Coverage   66.64%   66.64%           
=======================================
  Files         312      312           
  Lines       27745    27748    +3     
  Branches     6199     6201    +2     
=======================================
+ Hits        18490    18492    +2     
- Misses       9255     9256    +1     

Impacted Files	Coverage Δ
@here/harp-mapview/lib/VisibleTileSet.ts	79.77% <0.00%> (-0.09%)	⬇️

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