Fix copying of SSH keys from WSL to Windows

[guillaumehu]

When running in WSL, it looks like we are copying the id_rsa before creating them. In this PR, we check if we need to copy them after the creation.

I am not sure what to do if the Windows ssh config file did not changed, should we still copy the id_rsa ? I am referring to this line

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.89%. Comparing base (63cc24f) to head (28e4067).

Files with missing lines	Patch %	Lines
milatools/cli/commands.py	0.00%	3 Missing ⚠️
milatools/cli/init_command.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   74.16%   73.89%   -0.27%     
==========================================
  Files          17       17              
  Lines        2307     2314       +7     
==========================================
- Hits         1711     1710       -1     
- Misses        596      604       +8     

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