[Fix] Fix swin load state_dict

[xiexinch]

Motivation

Fix the problem that state_dict is not loaded correctly.

Modification

Use self.load_state_dict instead of mmengine.runner.load_state_dict

[codecov]

Codecov Report

Base: 83.55% // Head: 83.57% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (fc25591) compared to base (a39b16f).
Patch coverage: 50.00% of modified lines in pull request are covered.

❗ Current head fc25591 differs from pull request most recent head 26e9729. Consider uploading reports for the commit 26e9729 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2304      +/-   ##
===========================================
+ Coverage    83.55%   83.57%   +0.02%     
===========================================
  Files          141      141              
  Lines         7970     7970              
  Branches      1192     1192              
===========================================
+ Hits          6659     6661       +2     
+ Misses        1121     1119       -2     
  Partials       190      190              

Flag	Coverage Δ
unittests	83.57% <50.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
mmseg/models/backbones/swin.py	83.56% <50.00%> (ø)
mmseg/models/backbones/timm_backbone.py	45.83% <0.00%> (+8.33%)	⬆️

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