fix: properly close the <tree> tag in benchmark

Author: mhevery

modules/benchmarks/src/tree/tree_benchmark.js

@@ -44,8 +44,8 @@ function setup() {
           directives: [TreeComponent, NgIf],
           inline: `
     <span> {{data.value}}
-       <span template='ng-if data.left != null'><tree [data]='data.left'></span>
-       <span template='ng-if data.right != null'><tree [data]='data.right'></span>
+       <span template='ng-if data.left != null'><tree [data]='data.left'></tree></span>
+       <span template='ng-if data.right != null'><tree [data]='data.right'></tree></span>
     </span>`
       })
     })]