Delete column from multi-cell selection doesn not work properly on colspaned cells

[jodator]

📝 Provide detailed reproduction steps (if any)

Steps as in #6434 and #6406

✔️ Expected result

Each column from selection should be removed.

❌ Actual result

It looks like the command is executed for each cell from an original selection. This is wrong because of the delete column on spanned cell removes span from that cell - thus this command should be executed two times for spanned cell.

📃 Other details

Other commands that might be affected: remove rows.

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[jodator]

Looks like dup fo #6406