[Fix] the path separator problem of mim run on Windows

[RangeKing]

Motivation

mim run mmdet analyze_logs plot_curve .\yolov5_n-v61_syncbn_fast_8xb16-300e_coco_20220919_090739.l og.json --keys loss_cls --legend loss_cls

before:

after:

Modification

replace all '/' with os.sep in run.py

[codecov]

Codecov Report

Base: 56.62% // Head: 56.62% // No change to project coverage 👍

Coverage data is based on head (1624b27) compared to base (6d94741).
Patch coverage: 20.00% of modified lines in pull request are covered.

❗ Current head 1624b27 differs from pull request most recent head 855ef04. Consider uploading reports for the commit 855ef04 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #177   +/-   ##
=======================================
  Coverage   56.62%   56.62%           
=======================================
  Files          24       24           
  Lines        1584     1584           
  Branches      334      334           
=======================================
  Hits          897      897           
  Misses        549      549           
  Partials      138      138           

Flag	Coverage Δ
unittests	56.62% <20.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mim/commands/run.py	49.31% <20.00%> (ø)

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[ice-tong]

Hi @RangeKing, sorry for the late reply. This changes looks grate to me, thanks for your contribution!