Fix reference to transient MI tag in DuplexConsensusCaller

[clintval]

@nh13 I'm pretty sure this is what you meant in #493?

I haven't done any benchmarking, but maybe this PR is a free speed-up!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d748c76) 95.60% compared to head (9f6b2e4) 95.60%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #946   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files         126      126           
  Lines        7308     7308           
  Branches      487      508   +21     
=======================================
  Hits         6987     6987           
  Misses        321      321           

Flag	Coverage Δ
unittests	95.60% <100.00%> (ø)

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Files	Coverage Δ
...om/fulcrumgenomics/umi/DuplexConsensusCaller.scala	96.75% <100.00%> (ø)

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[nh13]

It’s a bug nonetheless. Thank you!