Fix unwrap_in_result clippy warning

[thomaskrause]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 67.21%. Comparing base (91b8558) to head (16a0f9b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
graphannis/src/annis/db/corpusstorage.rs	60.00%	2 Missing and 6 partials ⚠️
cli/src/bin/annis_bench_queries.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
+ Coverage   67.17%   67.21%   +0.03%     
==========================================
  Files          77       77              
  Lines       18987    18967      -20     
  Branches    18987    18967      -20     
==========================================
- Hits        12755    12748       -7     
+ Misses       4757     4749       -8     
+ Partials     1475     1470       -5     

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