expect: Fix edge case in part 19

[pedrottimark]

Summary

Added a missing comment and condition

No update to CHANGELOG.md if we merge it in same batch as #8367

Test plan

Added 1 snapshot

Example picture baseline at left and improved at right

[jeysal]

LGTM. Does the opposite (only superclass has a name) already have a test case?

[pedrottimark]

Added the missing test and adjusted format to omit gap at left of received class name:

[codecov-io]

Codecov Report

Merging #8394 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8394      +/-   ##
==========================================
+ Coverage   62.34%   62.35%   +<.01%     
==========================================
  Files         266      266              
  Lines       10738    10736       -2     
  Branches     2612     2611       -1     
==========================================
- Hits         6695     6694       -1     
  Misses       3460     3460              
+ Partials      583      582       -1

Impacted Files	Coverage Δ
packages/expect/src/print.ts	97.72% <100%> (+2.07%)	⬆️

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