Fix invalid prop 'node.type' supplied to 'Props'

[thomasbertet]

Issue: #1307

What I did

• Use the PropTypes.node directly instead of specifying specific node & type key.

How to test

• Switch to current master branch
• Launch storybook of examples/cra-kitchen-sink, go to Button >> with some infos.
• Check the console, it displays the message: Warning: Failed prop type: Invalid prop node.typesupplied toProps, expected a ReactNode

Now switch to this branch, launch storybook & display the same story.

• No warning should be visible in the console.

Let me know if you need anything else !

[codecov]

Codecov Report

Merging #1351 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1351   +/-   ##
=======================================
  Coverage   13.75%   13.75%           
=======================================
  Files         202      202           
  Lines        4623     4623           
  Branches      509      506    -3     
=======================================
  Hits          636      636           
- Misses       3543     3554   +11     
+ Partials      444      433   -11

Impacted Files	Coverage Δ
addons/info/src/components/Props.js	0% <ø> (ø)	⬆️
lib/ui/src/modules/ui/containers/layout.js	12.5% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
app/react/src/server/build.js	0% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/client_api.js	39.28% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_routing.js	28.94% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
... and 17 more

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[shilman]

LGTM and tested. @adamdonahue can you comment on this, or @ndelangen since you merged #1245?