Minor fix to librimix diar recipe

[ftshijt]

No description provided.

[codecov]

Codecov Report

Merging #4867 (c71cd03) into master (c7a5d65) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4867   +/-   ##
=======================================
  Coverage   78.76%   78.76%           
=======================================
  Files         571      571           
  Lines       51322    51322           
=======================================
  Hits        40424    40424           
  Misses      10898    10898           

Flag	Coverage Δ
test_integration_espnet1	66.39% <ø> (ø)
test_integration_espnet2	48.33% <ø> (ø)
test_python	68.16% <ø> (ø)
test_utils	23.34% <ø> (ø)

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