add useState import to useStateSnippet

[Thorsten Herfurtner]

I'm kinda confused as I'm pretty sure, that I've used this vs code extension on my old macbook that died in june.
But on my old machine the shortcut for the useState snippet was "useState" instead of "useStateSnippet", which lead to confusions, so "useStateSnippet" is the better shortcut.

Anyway the old snippet always updated the React import if useState hasn't been imported yet in the file. And I desperately would love to have that functionality again. Is there any setting I need to enable?

I already have that "importReactOnTop" setting enabled, but that doesn't seem to do the trick here.