fix(table): revert IHeaderRow interface change

[dlabrecq]

It appears we changed an interface when introducing linting to the react-table package. This is exported, so reverting the breaking change.

fixes #3744

[patternfly-build]

PF3 preview: https://patternfly-react-pr-3746-pf3.surge.sh
PF4 preview: https://patternfly-react-pr-3746.surge.sh
A11y report: https://patternfly-react-pr-3746-coverage.surge.sh

[ddonahue007]

LGTM

[evwilkin]

LGTM - thanks Dan!

[codecov-io]

Codecov Report

Merging #3746 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3746   +/-   ##
=======================================
  Coverage   71.23%   71.23%           
=======================================
  Files         779      779           
  Lines       10492    10492           
  Branches     2264     2264           
=======================================
  Hits         7474     7474           
  Misses       2592     2592           
  Partials      426      426

Flag	Coverage Δ
#misc	95.45% <ø> (ø)	⬆️
#patternfly3	85.89% <ø> (ø)	⬆️
#patternfly4	60.15% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
...rnfly-4/react-table/src/components/Table/Table.tsx	69.56% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fa650a3...93f6d80. Read the comment docs.