[DataGrid] Fix ownerState undefined in theme style overrides

[lolaignatova]

Fixes #4413

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	470.6	817.6	589.3	628.44	149.222
Sort 100k rows	ms	539.5	967	817.9	783.22	157.512
Select 100k rows	ms	202.7	279.3	222.5	235.76	29.282
Deselect 100k rows	ms	140.7	241.2	190.2	188.36	32.118

Generated by 🚫 dangerJS against 9cbceea

[lolaignatova]

Hi MUI team.

Can you please help me to add label to this MR? Because I don't have access unfortunately.
And I see changes on layouts argos step but the reason that comparison is happening with next branch I believe.
It's important to target master branch with this changes. I hope it meets your expectations as well.

[m4theushw]

Thanks for spending time on this! Your changes seem to impact the commercially licensed code. For any changes of this nature, we require contributors to sign the MUI’s Contributor License Agreement (CLA). However, I can’t find a CLA signed that could cover these changes. Please follow the steps at https://mui-org.notion.site/CLA-Contributor-License-Agreement-92ece655b1584b10b00e4de9e67eedb0 to sign the document.

[lolaignatova]

@m4theushw Done! Thanks for explanation

[zannager]

CLA signed, thanks.