Fix clippy warning on 'format!' strings

[jellehelsen]

Should fix #223

[tertsdiepraam]

Looks good! Can be merged once the CI is green

[codecov]

Codecov Report

Merging #272 (6068512) into main (bdc18fd) will increase coverage by 0.54%.
The diff coverage is 84.09%.

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   55.85%   56.40%   +0.54%     
==========================================
  Files          30       30              
  Lines        3774     3796      +22     
  Branches      957      957              
==========================================
+ Hits         2108     2141      +33     
+ Misses       1319     1310       -9     
+ Partials      347      345       -2     

Files Changed	Coverage Δ
src/find/matchers/delete.rs	76.19% <0.00%> (ø)
src/find/matchers/logical_matchers.rs	80.39% <ø> (ø)
src/find/matchers/mod.rs	65.20% <ø> (ø)
src/find/matchers/size.rs	78.04% <ø> (ø)
src/find/matchers/type_matcher.rs	88.23% <ø> (ø)
src/find/mod.rs	66.66% <0.00%> (ø)
src/find/matchers/printf.rs	70.62% <77.77%> (ø)
src/xargs/mod.rs	86.16% <80.00%> (+2.87%)	⬆️
tests/xargs_tests.rs	100.00% <100.00%> (ø)