Fix 3'UTR in sequence detail panels when no UTRs are in gff

[cmdcolin]

This fixes an off-by-one bug in the display of "cDNA" sequences in the feature panel. Might need to follow up with some confirmation

[codecov]

Codecov Report

Merging #2018 (90b10bb) into main (d690c35) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2018      +/-   ##
==========================================
- Coverage   60.87%   60.84%   -0.03%     
==========================================
  Files         473      473              
  Lines       22549    22549              
  Branches     5244     5244              
==========================================
- Hits        13727    13721       -6     
- Misses       8539     8546       +7     
+ Partials      283      282       -1     

Impacted Files	Coverage Δ
.../core/BaseFeatureWidget/SequenceFeatureDetails.tsx	56.05% <ø> (+1.91%)	⬆️
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	80.24% <0.00%> (-7.41%)	⬇️
...inearGenomeView/components/RefNameAutocomplete.tsx	88.88% <0.00%> (-4.45%)	⬇️
packages/core/util/analytics.ts	83.72% <0.00%> (-2.33%)	⬇️

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