Fix issue with synteny polygons displaying slightly offset

[cmdcolin]

Fixes #1895

Currently bpToPx overestimates the amount of times it needs to incorporate interRegionPaddingBlock to all the displayedRegions that are offscreen to the left of any particular view

It actually only needs to incorporate the interRegionPaddingBlock for any displayedRegion that is on the blocks, not ones that are off screen to the left.

A similar concept was incorporated in pxToBp (which was much needed when using show all regions in assembly) but needed to be applied to bpToPx here too.

[codecov]

Codecov Report

Merging #1904 (e0ff376) into main (a1d8401) will increase coverage by 0.04%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main    #1904      +/-   ##
==========================================
+ Coverage   58.55%   58.60%   +0.04%     
==========================================
  Files         460      460              
  Lines       21333    21357      +24     
  Branches     5066     5084      +18     
==========================================
+ Hits        12492    12516      +24     
  Misses       8534     8534              
  Partials      307      307              

Impacted Files	Coverage Δ
packages/core/util/Base1DViewModel.ts	78.37% <93.75%> (+1.17%)	⬆️
...s/linear-genome-view/src/LinearGenomeView/index.ts	83.44% <93.75%> (+0.17%)	⬆️
packages/core/util/index.ts	81.28% <0.00%> (ø)
...inearGenomeView/components/RefNameAutocomplete.tsx	93.61% <0.00%> (+4.25%)	⬆️

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