fix(datagrid): remove expand cell from calculations (backport to 16.x) #1582
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Backport a51d2d8 from #1581.
## PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
<!-- Please check the one that applies to this PR using "x". -->
What is the current behavior?
Expandable rows first cell with the trigger it's rendered when calculations are happening and it's creating wrong widths for columns.

<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
Issue Number: #1487
What is the new behavior?
That cell is excluded from calculations and they are correct.

Does this PR introduce a breaking change?
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