fix config import on windows

[vdiskg]

What's the purpose of this PR

file separator on windows is "\"

Which issue(s) this PR fixes:

Fixes #

Brief changelog

XXXXX

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• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
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• Update the CHANGES log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c90c930) 50.30% compared to head (b199d82) 50.36%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5088      +/-   ##
============================================
+ Coverage     50.30%   50.36%   +0.05%     
  Complexity     2010     2010              
============================================
  Files           387      387              
  Lines         12213    12213              
  Branches       1207     1207              
============================================
+ Hits           6144     6151       +7     
+ Misses         5706     5697       -9     
- Partials        363      365       +2     

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[nobodyiam]

LGTM