fix(runtime-core): pass prev value to hostPatchProp (#809)

fix #808

packages/runtime-core/src/renderer.ts

@@ -831,7 +831,7 @@ function baseCreateRenderer<
               el,
               key,
               null,
-              null,
+              oldProps[key],
               isSVG,
               vnode.children as HostVNode[],
               parentComponent,