Object proptype is shown in addon-info proptable

[binomialstew]

What I did

Corrects this issue.

[Hypnosphi]

Live preview

[codecov]

Codecov Report

Merging #3255 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3255      +/-   ##
==========================================
- Coverage   35.85%   35.61%   -0.25%     
==========================================
  Files         444      442       -2     
  Lines        9731     9777      +46     
  Branches      909      911       +2     
==========================================
- Hits         3489     3482       -7     
- Misses       5652     5716      +64     
+ Partials      590      579      -11

Impacted Files	Coverage Δ
addons/info/src/components/types/PrettyPropType.js	85.71% <ø> (-0.29%)	⬇️
addons/knobs/src/components/types/Object.js	5.88% <0%> (-11.36%)	⬇️
addons/links/src/react/components/link.js	78.78% <0%> (ø)	⬆️
lib/ui/src/modules/shortcuts/actions/shortcuts.js	18.84% <0%> (ø)	⬆️
addons/storysource/src/loader/parsers/index.js	44.44% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
addons/knobs/src/components/types/Button.js	11.9% <0%> (ø)	⬆️
addons/actions/src/lib/types/infinity/index.js	80% <0%> (ø)	⬆️
addons/knobs/src/components/types/Array.js	34.14% <0%> (ø)	⬆️
app/angular/src/server/angular-cli_config.js	0% <0%> (ø)	⬆️
... and 56 more

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[binomialstew]

Please let me know if there's anything I can do for this