Fix wrong messages for nthCalledWith

[chinesedfan]

Summary

formatMismatchedCalls prints the last x(usually x = 1) calls messages, but is not suitable for nthCalledWith. Same with #6338.

Test plan

[chinesedfan]

@SimenB The old branch was force-updated and the PR was closed automatically, so I recreate another one. No new tests are added, but I fixed the original snapshot.

[rickhanlonii]

Math checks out

[codecov-io]

Codecov Report

Merging #6340 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6340   +/-   ##
=======================================
  Coverage   63.89%   63.89%           
=======================================
  Files         228      228           
  Lines        8705     8705           
  Branches        4        3    -1     
=======================================
  Hits         5562     5562           
  Misses       3142     3142           
  Partials        1        1

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[github-actions]

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