fix(xy): default min domain for log scales to baseline value

[markov00]

Summary

The #1014 PR introduced a breaking change that causes the log scale to use always the min value of the data domain as the min value for the scale domain.
This creates a, probably unwanted, breaking change because suddenly every Y axis using a log scale will be scaled to from the min to the max value of the datum, as opposed to the actual implementation that always scales from a minimum value of 1 (the LOG base min) to the max of the domain.

[codecov-io]

Codecov Report

Merging #1028 (313bd83) into master (0f52688) will increase coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1028      +/-   ##
==========================================
+ Coverage   72.86%   73.26%   +0.40%     
==========================================
  Files         363      379      +16     
  Lines       11235    11542     +307     
  Branches     2446     2494      +48     
==========================================
+ Hits         8186     8456     +270     
- Misses       3035     3064      +29     
- Partials       14       22       +8     

Flag	Coverage Δ
unittests	72.86% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/chart_types/xy_chart/domains/x_domain.ts	100.00% <100.00%> (ø)
src/chart_types/xy_chart/domains/y_domain.ts	97.93% <100.00%> (ø)
src/utils/domain.ts	97.43% <100.00%> (ø)
src/mocks/series/series.ts	91.22% <0.00%> (ø)
src/mocks/specs/index.ts	100.00% <0.00%> (ø)
src/mocks/series/data.ts	100.00% <0.00%> (ø)
src/mocks/theme.ts	86.66% <0.00%> (ø)
src/mocks/utils.ts	100.00% <0.00%> (ø)
src/mocks/scale/scale.ts	77.77% <0.00%> (ø)
src/mocks/specs/specs.ts	81.81% <0.00%> (ø)
... and 9 more

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