fix tabs ref proptype

[jschuler]

Closes: #2151 #2132

[codecov-io]

Codecov Report

Merging #2158 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2158      +/-   ##
==========================================
+ Coverage   80.49%   80.51%   +0.01%     
==========================================
  Files         649      649              
  Lines        8225     8225              
  Branches      610      610              
==========================================
+ Hits         6621     6622       +1     
+ Misses       1308     1307       -1     
  Partials      296      296

Flag	Coverage Δ
#patternfly3	85.22% <ø> (ø)	⬆️
#patternfly4	75.77% <100%> (+0.02%)	⬆️
#patternflymisc	95.68% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
...fly-4/react-core/src/components/Tabs/TabContent.js	83.33% <ø> (ø)	⬆️
...patternfly-4/react-core/src/components/Tabs/Tab.js	100% <100%> (ø)	⬆️
...atternfly-4/react-core/src/components/Tabs/Tabs.js	80.76% <0%> (+1.92%)	⬆️

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[patternfly-build]

PatternFly-React preview: https://2158-pr-patternfly-react-patternfly.surge.sh

[tlabaj]

LGTM

[jschuler]

Closing i think there is still an issue left. will reopen when ready

[jschuler]

It's good to merge as is