[tokenizer] set truncatation to default

[frankfliu]

Avoid crash when token exceed model max length.

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.29%. Comparing base (ae00167) to head (ec0959d).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3068   +/-   ##
=========================================
  Coverage     72.28%   72.29%           
- Complexity     7302     7303    +1     
=========================================
  Files           722      722           
  Lines         32593    32592    -1     
  Branches       3410     3410           
=========================================
+ Hits          23561    23563    +2     
  Misses         7407     7407           
+ Partials       1625     1622    -3     

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