admin/transfer_crates: Remove unnecessary database transaction

[Turbo87]

There is only a single write query in this code path, so the transaction is somewhat unnecessary. This also simplifies the confirmation code a little bit since it doesn't have to rely on exit(0) anymore.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 88.90%. Comparing base (429e1be) to head (30c52a2).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/admin/transfer_crates.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9582   +/-   ##
=======================================
  Coverage   88.90%   88.90%           
=======================================
  Files         289      289           
  Lines       29123    29124    +1     
=======================================
+ Hits        25892    25893    +1     
  Misses       3231     3231           

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