Solved +/- buttons on <xf:numberbox> fail when using step="any"

[DragonByte Tech]

Reproduction: <xf:numberbox name="some_number" value="1" min="1" step="any" data-step="1" />

Error:


This is a regression from XenForo 2.2.x where the native stepUp / stepDown functions had a fallback.

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