Fix bug in ngram training in slu.sh

[siddhu001]

What?

Made minor fix in slu.sh

Why?

There was bug in ngram training code in slu.sh that used only first token instead of all tokens in transcripts.

See also

Refer #5312

[codecov]

Codecov Report

Merging #5364 (79f5cc0) into master (42f3182) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5364      +/-   ##
==========================================
- Coverage   76.11%   76.11%   -0.01%     
==========================================
  Files         672      672              
  Lines       59859    59859              
==========================================
- Hits        45563    45561       -2     
- Misses      14296    14298       +2     

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	65.93% <ø> (ø)
test_integration_espnet2	47.91% <ø> (-0.01%)	⬇️
test_python_espnet1	20.51% <ø> (ø)
test_python_espnet2	51.35% <ø> (ø)
test_utils	23.17% <ø> (ø)

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see 1 file with indirect coverage changes

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