fix(server): improve logging for deleted file

[tessus]

Description

This change converts a path to a string.

Motivation and Context

Before

<TIMESTAMP> INFO rustypaste::server: deleted file: Path("file-to-delete.txt")

After

<TIMESTAMP> INFO rustypaste::server: deleted file: "file-to-delete.txt"

How Has This Been Tested?

• manually
• fixtures (no new tests)
• cargo test (no new tests)

Changelog Entry

### Changed

- Improved server side logging when deleting a file

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8de2450) 70.11% compared to head (40559f7) 70.11%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #235   +/-   ##
=======================================
  Coverage   70.11%   70.11%           
=======================================
  Files          11       11           
  Lines         609      609           
=======================================
  Hits          427      427           
  Misses        182      182           

Flag	Coverage Δ
unit-tests	70.11% <100.00%> (ø)

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[orhun]

Nice!