Fix replace for fetched urls

[quambene]

Fix --replace for bogrep fetch --urls <URLs>

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 89.06%. Comparing base (a4764ab) to head (f303860).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bookmarks/bookmark_service.rs	0.00%	3 Missing ⚠️
src/cmd/fetch.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   89.16%   89.06%   -0.11%     
==========================================
  Files          40       40              
  Lines        6083     6088       +5     
==========================================
- Hits         5424     5422       -2     
- Misses        659      666       +7     

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