[rust] Fix camembert and distilbert model loading

[xyang16]

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]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.58%. Comparing base (c4baffb) to head (5e96385).
Report is 69 commits behind head on master.

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Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3415       +/-   ##
=============================================
+ Coverage     58.25%   72.58%   +14.33%     
- Complexity     5737     7366     +1629     
=============================================
  Files           668      668               
  Lines         32509    32592       +83     
  Branches       3439     3461       +22     
=============================================
+ Hits          18937    23656     +4719     
+ Misses        12125     7324     -4801     
- Partials       1447     1612      +165     

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