fix: unfreeze nested children array before passing it to linkArray

[Xazzzi]

When children of decorated component happen to have nested arrays in them:

[
el1,
[el2, el3],
el4,
]

linkClass.js:86 unfreezeObject will unfreeze only 1 level in depth (i.e. first array, but not nested one), leading to TypeError: cannot assign to readonly property 0.
This PR should fix it by checking if array passed to linkArray recurse call is frozen, unfreezing if necessary.