Update ListSelectorViewController to use safe index accessors

[Ecarrion]

Closes: #14070
peaMlT-Vj-p2

Context

command.data[indexPath.row] should never fail as the dataset does not mutate, but according to crash reports it does.
I assume that this happens when the view is used in a SwiftUI hosting environment and some variables could be updated or mutated due to the underlying view lifecycle, causing the command data to be inconsistent with the current index path.

How

• Updates ListSelectorViewController to use safe index accessors to prevent any out of index crash.

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

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📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr14077-b25ba6a
	Version	20.6
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	b25ba6a
	App Center Build	WooCommerce - Prototype Builds #11063

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