Fix useState to support primitive values in setState

Author: sekiguchi-aym

didact.js

@@ -219,7 +219,7 @@ function useState(initial) {
   })
 
   const setState = action => {
-    hook.queue.push(action)
+    hook.queue.push(typeof action === "function" ? action : (prev) => action)
     wipRoot = {
       dom: currentRoot.dom,
       props: currentRoot.props,
@@ -316,4 +316,4 @@ function Counter() {
 }
 const element = <Counter />
 const container = document.getElementById("root")
-Didact.render(element, container)
+Didact.render(element, container)