jsonstream: Display: rename var that shadowed type

[thaJeztah]

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.42%. Comparing base (4771aba) to head (8169a51).
Report is 2 commits behind head on master.

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5787   +/-   ##
=======================================
  Coverage   59.42%   59.42%           
=======================================
  Files         347      347           
  Lines       29395    29395           
=======================================
  Hits        17469    17469           
  Misses      10954    10954           
  Partials      972      972           

[thaJeztah]

Flaky test?

63.89 === FAIL: cli/command/image TestPrunePromptTermination (0.00s)
63.89     prune_test.go:128: assertion failed: error is "image prune has been cancelled" (errdefs.errCancelled), not "prompt terminated" (command.ErrPromptTerminated errdefs.errCancelled)