Tab: Select the first item if activeTabIndex is out of bounds

[edizcelik]

After a Tab component is rendered on the screen, we can modify the items prop and pass in a new array. For example, we might display one tab on larger screens while two tabs on the smaller screens. If the second item was selected as active and then the screen size is changed so that the items array has only one element in it, activeTabIndex becomes out of bounds and we don't display anything as the tab body. In this case, I think we can simply fallback and set the activeTabIndex as 0. Example use case of this is available on Tinyman on the staking program detail.