[Fix] Fix UniFormer README and metafile

[cir7]

Motivation

[Fix] Fix UniFormer README and metafile

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: -0.03 ⚠️

Comparison is base (07259a2) 76.97% compared to head (5b797bd) 76.94%.

❗ Current head 5b797bd differs from pull request most recent head a7faa80. Consider uploading reports for the commit a7faa80 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2450      +/-   ##
==========================================
- Coverage   76.97%   76.94%   -0.03%     
==========================================
  Files         159      159              
  Lines       12546    12548       +2     
  Branches     2099     2100       +1     
==========================================
- Hits         9657     9655       -2     
- Misses       2386     2388       +2     
- Partials      503      505       +2     

Flag	Coverage Δ
unittests	76.94% <84.61%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
mmaction/datasets/transforms/wrappers.py	56.34% <0.00%> (-0.91%)	⬇️
mmaction/models/heads/base.py	80.95% <ø> (ø)
mmaction/models/utils/blending_utils.py	90.42% <77.77%> (-1.71%)	⬇️
mmaction/__init__.py	100.00% <100.00%> (ø)
mmaction/evaluation/metrics/acc_metric.py	81.29% <100.00%> (-0.70%)	⬇️
mmaction/models/losses/cross_entropy_loss.py	65.27% <100.00%> (+0.48%)	⬆️

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[Dai-Wenxun]

LGTM