Revert "Replace decorate with decorateAction"

[Hypnosphi]

Reverts #3538

Sorry, I overlooked this one. The thing is, decorate was introduced and decorateAction deprecated (not formally though) in #3352

@fvilers docs for stable version are here: https://github.com/storybooks/storybook/tree/release/3.4/addons/knobs

[codecov]

Codecov Report

Merging #3600 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3600   +/-   ##
=======================================
  Coverage   36.48%   36.48%           
=======================================
  Files         490      490           
  Lines       10271    10271           
  Branches      943      952    +9     
=======================================
  Hits         3747     3747           
+ Misses       5962     5933   -29     
- Partials      562      591   +29

Impacted Files	Coverage Δ
addons/a11y/src/components/Report/Item.js	0% <0%> (ø)	⬆️
addons/a11y/src/components/Tabs.js	0% <0%> (ø)	⬆️
lib/components/src/table/table.js	83.33% <0%> (ø)	⬆️
addons/viewport/src/manager/components/Panel.js	37.26% <0%> (ø)	⬆️
addons/a11y/src/components/Report/RerunButton.js	0% <0%> (ø)	⬆️
addons/info/src/components/types/PropertyLabel.js	78.94% <0%> (ø)	⬆️
lib/core/src/server/utils.js	40.47% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.63% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/stories_panel.js	25% <0%> (ø)	⬆️
lib/ui/src/modules/api/index.js	0% <0%> (ø)	⬆️
... and 62 more

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[fvilers]

@Hypnosphi Sorry about that, I was using the latest version and couldn't find decorate. I should have look at the source history.