[Fix] Modify double lq_path to gt_path in test_pipeline

[ryanxingql]

Some meta_keys in config files might should be ['lq_path', 'gt_path'] instead of ['lq_path', 'lq_path'].

PS Two ipynb files 1 and 2 should be re-run to fix the typos. I haven't done that yet.

[codecov]

Codecov Report

Merging #862 (bc3e3c4) into master (a852622) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
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  Coverage   83.12%   83.12%           
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  Files         220      220           
  Lines       12453    12453           
  Branches     2017     2017           
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  Hits        10351    10351           
  Misses       1785     1785           
  Partials      317      317           

Flag	Coverage Δ
unittests	83.08% <ø> (ø)

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[wangruohui]

I think this is not a typo. In test pipeline, we don't actually have the gt_path.

[Yshuo-Li]

I think this is not a typo. In test_pipeline, we don't actually have the gt_path.

This is a typo.

1. If there is no gt_path, the test pipeline cannot load gt by LoadImageFromFile.
2. In demo scripts, if the configure file doesn't contain demo_pipeline, test_pipeline will be used for inference. However, demo scripts will remove gt and gt_path from the pipeline.

Besides, the reason why this typo doesn't raise any error is that gt_path is not used in the follow-up processing.