fix resizing of draggable header cell

[starkysclub]

Description

A few sentences describing the overall goals of the pull request's commits.

Please check if the PR fulfills these requirements

• [x ] The commit message follows our guidelines: https://github.com/adazzle/react-data-grid/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• [ x] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
While resizing draggable header cell, it computes the left position incorrectly

What is the new behavior?
While resizing draggable header cell, it computes the left position correctly

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x ] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:
It's separated from #1449 we need to merge as soon as possible :)

[anushkadoyan]

can we merge this please?

[amanmahajan7]

Closing this PR as old version of rdg are no longer supported and this bug is fixed in canary

https://github.com/adazzle/react-data-grid/blob/canary/CHANGELOG.md
https://adazzle.github.io/react-data-grid/canary/?path=/story/demos--common-features
https://github.com/adazzle/react-data-grid/tree/canary/stories/demos