Adjust _setColumns to deep clone properly and only once on recursive nodes.
_setColumns has a local function called copyObj that is used to clone the columns config to prevent it from potentially busting the use of that object outside of DataTable. arrayIndex, a pointer to Y.Array.indexOf, is used to look up to prevent infinite recursion during the clone.
arrayIndex had the arguments in the wrong order. This pr is submitted to correct this.
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