fix: perf test syntax

Author: jhefferman-sfdc

packages/@lwc/perf-benchmarks-components/src/benchmark/expression/expression.html

@@ -5,7 +5,7 @@
 For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
 -->
 <template>
-  <div data-foo={expr1()}></div>
-  <p class={expr2.expr21.expr22}></p>
+  <div data-foo="{expr1()}"></div>
+  <p class="{expr2.expr21.expr22}"></p>
   <p>{expr3[0]['expr3' + '3']}</p>
 </template>