Fix SR_QA_AEROSOL asset key.

[lossyrob]

This fixes a typo where the SR_QA_AEROSOL had an incorrect asset key of "SR_B8"

[codecov-commenter]

Codecov Report

Merging #126 (57c3c49) into master (2c13ad7) will increase coverage by 0.31%.
The diff coverage is 93.10%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   84.94%   85.26%   +0.31%     
==========================================
  Files          81       82       +1     
  Lines        2471     2463       -8     
==========================================
+ Hits         2099     2100       +1     
+ Misses        372      363       -9     

Impacted Files	Coverage Δ
stactools_landsat/stactools/landsat/assets.py	100.00% <ø> (ø)
stactools_sentinel2/stactools/sentinel2/cog.py	0.00% <0.00%> (ø)
..._sentinel2/stactools/sentinel2/product_metadata.py	91.01% <ø> (ø)
stactools_aster/stactools/aster/cog.py	98.57% <100.00%> (-0.03%)	⬇️
stactools_cgls_lc100/stactools/cgls_lc100/cog.py	100.00% <100.00%> (ø)
stactools_core/stactools/core/utils/convert.py	100.00% <100.00%> (ø)
stactools_corine/stactools/corine/cog.py	100.00% <100.00%> (ø)
...tactools_landsat/stactools/landsat/mtl_metadata.py	95.61% <100.00%> (+0.42%)	⬆️

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