Fix select knob default selection with array
Fix select knob default selection with array

When using a select knob with arrays as option values, the selected key for the default value was not getting set properly.  The code was comparing two arrays with ===, which is always false.  This stringifies the arrays and then does the comparison.

storybooks/react-storybook,storybooks/storybook,storybooks/storybook,kadirahq/react-storybook,storybooks/storybook,storybooks/storybook,storybooks/storybook,storybooks/storybook,storybooks/react-storybook,storybooks/react-storybook,kadirahq/react-storybook,storybooks/storybook,storybooks/react-storybook