keep input box for interactive input up on focus out

[IanMatthewHuff]

For #11581

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR).
• Title summarizes what is changing.
• Has a news entry file (remember to thank yourself!).
• Appropriate comments and documentation strings in the code.
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated.
• Test plan is updated as appropriate.
• package-lock.json has been regenerated by running npm install (if dependencies have changed).
• The wiki is updated with any design decisions/details.

[IanMatthewHuff]

This came in on a recent customer report. Seemed like a kinda annoying issue to me as well and it was just a one liner. So pulled in the fix without waiting for triage.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-io]

Codecov Report

Merging #11604 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11604      +/-   ##
==========================================
- Coverage   60.66%   60.64%   -0.02%     
==========================================
  Files         619      619              
  Lines       33712    33712              
  Branches     4742     4742              
==========================================
- Hits        20450    20444       -6     
- Misses      12277    12281       +4     
- Partials      985      987       +2     

Impacted Files	Coverage Δ
src/client/datascience/jupyter/jupyterNotebook.ts	4.21% <ø> (ø)
src/datascience-ui/react-common/arePathsSame.ts	75.00% <0.00%> (-12.50%)	⬇️
src/client/common/utils/platform.ts	64.70% <0.00%> (-11.77%)	⬇️
src/client/linters/pydocstyle.ts	86.66% <0.00%> (-2.23%)	⬇️
src/client/datascience/debugLocationTracker.ts	76.56% <0.00%> (-1.57%)	⬇️
src/client/common/process/proc.ts	14.49% <0.00%> (-0.73%)	⬇️

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