test: fix import for elbv2 integ test (#1400)

follow up to #1379

Author: AllanZhengYP

features/elbv2/step_definitions/elbv2.js

@@ -1,7 +1,7 @@
-const { ElasticLoadBalancingv2 } = require("../../../clients/client-elastic-load-balancing-v2");
+const { ElasticLoadBalancingV2 } = require("../../../clients/client-elastic-load-balancing-v2");
 const { Before } = require("cucumber");
 
 Before({ tags: "@elbv2" }, function (scenario, callback) {
-  this.service = new ElasticLoadBalancingv2({});
+  this.service = new ElasticLoadBalancingV2({});
   callback();
 });