find: Use the uucore mode parsing implementation for -perm

[tavianator]

Fixes #26.

[sylvestre]

maybe there is already but would it be possible to have a test reproducing this previous error?
(integration non regression test)
thanks

[tavianator]

Which previous error do you mean?

[sylvestre]

this one:
#26 (comment)

[tavianator]

Ah good point, I'll add those!

[sylvestre]

Thanks :)

[codecov]

Codecov Report

Merging #154 (0b23d9b) into main (4cd4e4f) will increase coverage by 0.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   53.51%   53.55%   +0.04%     
==========================================
  Files          28       28              
  Lines        4802     4748      -54     
  Branches     1573     1553      -20     
==========================================
- Hits         2570     2543      -27     
+ Misses       1674     1668       -6     
+ Partials      558      537      -21     

Impacted Files	Coverage Δ
src/find/matchers/mod.rs	63.44% <ø> (ø)
src/find/matchers/perm.rs	62.50% <68.00%> (-5.39%)	⬇️
tests/find_cmd_tests.rs	83.76% <100.00%> (+0.77%)	⬆️
src/lib.rs	36.17% <0.00%> (ø)
src/xargs/mod.rs	80.31% <0.00%> (+2.59%)	⬆️

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