fix: dataset comparison default names

[alexbarros]

Change the default titles of the reports for Dataset {char} where char is a capital letter in the alphabetic order.

[codecov-commenter]

Codecov Report

Base: 90.45% // Head: 90.44% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (b7a398a) compared to base (c9850c2).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1159      +/-   ##
===========================================
- Coverage    90.45%   90.44%   -0.01%     
===========================================
  Files          181      181              
  Lines         5509     5516       +7     
===========================================
+ Hits          4983     4989       +6     
- Misses         526      527       +1     

Flag	Coverage Δ
py3.8-ubuntu-latest-pandas	90.44% <85.71%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ng/report/structure/variables/render_timeseries.py	93.10% <ø> (ø)
src/pandas_profiling/compare_reports.py	86.79% <85.71%> (-0.08%)	⬇️

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