Update install_nkf.sh

[sw005320]

fix nkf installation

[codecov]

Codecov Report

Merging #5300 (7f25511) into master (9bc4cb9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5300   +/-   ##
=======================================
  Coverage   67.16%   67.16%           
=======================================
  Files         658      658           
  Lines       59107    59107           
=======================================
  Hits        39702    39702           
  Misses      19405    19405           

Flag	Coverage Δ
test_python	66.53% <100.00%> (ø)
test_utils	23.17% <ø> (ø)

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Impacted Files	Coverage Δ
espnet2/bin/asr_inference_streaming.py	65.02% <100.00%> (ø)

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