docs: fix step-23-filtering-5295470.md

[depth1]

Removing the formatter property in the controller.
The formatter property is not used (even from the associated view) and is assigned a nonexistent value.

It seems that it is a leftover from an old version which no longer has any reason to exist; now formatter modules are directly loaded into the view via sap.ui.core.require.

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[OlMue]

Hi @depth1, thanks for your contribution! We'll look into it and will get back to you.

[KlattG]

Fixed with the forthcoming UI5 release.

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[depth1]

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