Delete removed core methods from definition file: `rowOffset`, `colOffset`

[AMBudnik]

Description

In Handsontable v8.0.0 we made the following change

rowOffset and colOffset were removed since they aliased the methods from Walkontable. #6547

However, we did not remove the methods from the definition file.

Release notes https://handsontable.com/docs/release-notes/#_8-0-0

Your environment

• Handsontable version: 8+
• Browser Name and version: n/a
• Operating System: n/a

[warpech]

Reopening as this should be closed only after the release of 12.1.3

[AMBudnik]

I'm closing this issue as done and released in Handsontable v12.1.3