Fix #5294: sphinx-quickstart blank prompts in PowerShell

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: sphinx-quickstart blank prompts in PowerShell #5294

[codecov]

Codecov Report

Merging #5312 into 1.7 will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##              1.7    #5312      +/-   ##
==========================================
- Coverage   82.04%   82.04%   -0.01%     
==========================================
  Files         284      284              
  Lines       37932    37935       +3     
  Branches     5880     5881       +1     
==========================================
+ Hits        31120    31122       +2     
- Misses       5498     5499       +1     
  Partials     1314     1314

Impacted Files	Coverage Δ
sphinx/cmd/quickstart.py	68.28% <50%> (-0.31%)	⬇️
sphinx/builders/html.py	82.53% <0%> (+0.11%)	⬆️

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[shimizukawa]

master

this branch

[shimizukawa]

default windows powershell colorschema

[shimizukawa]

I think bold in the PowerShell is yellow, so this PR looks good to me.

[tk0miya]

Thanks!