Use path without file://

[llrs-roche]

On my windows machine I cant' create.dir(random_repo(n=1), recursive = TRUE) if there is a file:// prefix on the path.
This PR removes it and uses the forward slash for Windows as I found that is what file.path() uses and creates less problems on windows.

This function is not covered by any tests, let me know if I add some tests for it

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 31.31%. Comparing base (c4d4e59) to head (b7829eb).

Files with missing lines	Patch %	Lines
R/class_pkg.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #49   +/-   ##
=======================================
  Coverage   31.31%   31.31%           
=======================================
  Files          36       36           
  Lines        1587     1587           
=======================================
  Hits          497      497           
  Misses       1090     1090           

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