Simplify table.replace_with

[hyanwong]

Fixes #2411

[codecov]

Codecov Report

Merging #2415 (d286619) into main (12afedc) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2415      +/-   ##
==========================================
- Coverage   93.34%   93.33%   -0.01%     
==========================================
  Files          28       28              
  Lines       26988    26978      -10     
  Branches     1246     1245       -1     
==========================================
- Hits        25191    25181      -10     
  Misses       1763     1763              
  Partials       34       34              

Flag	Coverage Δ
c-tests	92.26% <ø> (ø)
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.00% <100.00%> (-0.03%)	⬇️
python-tests	98.93% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
python/tskit/tables.py	98.96% <100.00%> (-0.01%)	⬇️

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[benjeffery]

LGTM!