Revert "feat(compiler-core): hoist element with static ref (#344)"

Static refs still need to be tracked in dynamicChildren because unmount
also takes the fast path when dynamicChildren is present, and all refs
need to be properly unmounted.

This reverts commit 920773fc6b.

packages/compiler-core/src/transforms/transformElement.ts

@@ -249,6 +249,9 @@ export function buildProps(
     const prop = props[i]
     if (prop.type === NodeTypes.ATTRIBUTE) {
       const { loc, name, value } = prop
+      if (name === 'ref') {
+        hasRef = true
+      }
       properties.push(
         createObjectProperty(
           createSimpleExpression(