fix: correct token creation CLI to ensure it works with default expiry

[corban-beaird]

Ticket

Description

In the event that expiration_days isn't provided, this corrects the missed declaration of the expiration_in_hours variable.

Test Plan

• det token create successfully creates a token with the default expiration duration.

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

[netlify]

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🔨 Latest commit	7484def
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.40%. Comparing base (27a014b) to head (7484def).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
harness/determined/cli/token.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10084      +/-   ##
==========================================
+ Coverage   54.39%   54.40%   +0.01%     
==========================================
  Files        1267     1267              
  Lines      159323   159324       +1     
  Branches     3630     3631       +1     
==========================================
+ Hits        86658    86675      +17     
+ Misses      72531    72515      -16     
  Partials      134      134              

Flag	Coverage Δ
backend	45.57% <ø> (+0.03%)	⬆️
harness	72.55% <0.00%> (-0.01%)	⬇️
web	53.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
harness/determined/cli/token.py	16.00% <0.00%> (-0.17%)	⬇️

... and 6 files with indirect coverage changes