Update TSE recipe egs2/librimix/tse1

[Emrys365]

What?

This PR addressed existing issues/bugs in the TSE recipe: egs2/librimix/tse1

Why?

See #5728

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.15%. Comparing base (fd9db8f) to head (5d07303).
Report is 1 commits behind head on master.

❗ Current head 5d07303 differs from pull request most recent head 038de87. Consider uploading reports for the commit 038de87 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5731       +/-   ##
===========================================
- Coverage   76.73%   23.15%   -53.59%     
===========================================
  Files         761      758        -3     
  Lines       69703    69805      +102     
===========================================
- Hits        53490    16163    -37327     
- Misses      16213    53642    +37429     

Flag	Coverage Δ
test_integration_espnet1	62.92% <ø> (ø)
test_integration_espnet2	?
test_integration_espnetez	?
test_python_espnet1	18.20% <ø> (-0.05%)	⬇️
test_python_espnet2	?
test_python_espnetez	?
test_utils	?

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[sw005320]

Thanks!
This must be fine, but we have a big PR #5724 for the format change.
So, after #5724 is merged, I'll merge this.