Fix log scaled histplot kde

[mwaskom]

Fixes #3171

x = np.random.lognormal(0, 1, 1000)
ax = sns.histplot(x=x, log_scale=True, kde=True)

[codecov]

Codecov Report

Merging #3173 (4cb58b7) into master (d4d27ad) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3173   +/-   ##
=======================================
  Coverage   98.41%   98.41%           
=======================================
  Files          76       76           
  Lines       24076    24082    +6     
=======================================
+ Hits        23695    23701    +6     
  Misses        381      381           

Impacted Files	Coverage Δ
seaborn/distributions.py	96.35% <100.00%> (ø)
tests/test_distributions.py	99.80% <100.00%> (+<0.01%)	⬆️