Flow types under-specified for visit() enter/leave methods under a specific kind.

[leebyron]

Example which should not encounter a type error, but does:

visit(doc, {
  FragmentDefinition: {
    enter(node) {
      console.log(node.name.value);
    },
  })

[IvanGoncharov]

Can't reproduce on master with Flow 0.79 looks like it was fixed by Flow update.