fix(waf): fixed widget height (#112)

Fixed WAFv2 widget height.

---

_By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license_

(cherry picked from commit 04a62fd)

Author: voho

lib/monitoring/aws-wafv2/WafV2Monitoring.ts

@@ -72,10 +72,10 @@ export class WafV2Monitoring extends Monitoring {
     return [
       this.createTitleWidget(),
       this.createAllowedRequestsWidget(ThirdWidth, DefaultGraphWidgetHeight),
-      this.createBlockedRequestsWidget(ThirdWidth, DefaultSummaryWidgetHeight),
+      this.createBlockedRequestsWidget(ThirdWidth, DefaultGraphWidgetHeight),
       this.createBlockedRequestsRateWidget(
         ThirdWidth,
-        DefaultSummaryWidgetHeight
+        DefaultGraphWidgetHeight
       ),
     ];
   }