improve(use-table): use single instance of defaultColumn property (#1451)
improve(use-table): use single instance of defaultColumn property (#1451)

in case of using construction like:
```
{
  defaultColumn = {}
}
```
`defaultColumn` will get new instance each time, so as result it force to recalculation each of `React.useMemo`.
react-tools/react-table,tannerlinsley/react-table