Fix whitespace on info add-on card

[lachlanjc]

Issue: info add-on cards have no bottom spacing, so story components run up against the card.

Before:

After:

Please let me know if this needs to be fixed/updated anywhere else!

[ndelangen]

Thanks you for your first PR @lachlanjc!

Looks like you need to run the unit tests and update the snapshots for this to be merge-able.
Do you need any help with that?

[ndelangen]

Code looks good, can you update the unit tests snapshots?

[codecov]

Codecov Report

Merging #2543 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2543   +/-   ##
=======================================
  Coverage   32.68%   32.68%           
=======================================
  Files         398      398           
  Lines        8838     8838           
  Branches      943      961   +18     
=======================================
  Hits         2889     2889           
+ Misses       5300     5278   -22     
- Partials      649      671   +22

Impacted Files	Coverage Δ
addons/info/src/components/Story.js	88.88% <100%> (ø)	⬆️
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
lib/ui/src/modules/ui/index.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/element_check.js	67.64% <0%> (ø)	⬆️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
...ents/stories_panel/stories_tree/tree_decorators.js	34.37% <0%> (ø)	⬆️
...modules/ui/components/stories_panel/text_filter.js	30.98% <0%> (ø)	⬆️
addons/a11y/src/components/Report/index.js	0% <0%> (ø)	⬆️
...i/src/modules/ui/components/stories_panel/index.js	18.51% <0%> (ø)	⬆️
... and 49 more

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[lachlanjc]

@ndelangen 1.46GB of downloads and 20 minutes later, updated 🙈✨

Snapshots updated