DynamicOptions: Remove redundant specification of type arguments

Change-Id: Ic6b9d4d95618afc1e352289e275c47bd3a35cf0e

gerrit-server/src/main/java/com/google/gerrit/server/DynamicOptions.java

@@ -100,7 +100,7 @@ public class DynamicOptions {
    */
   public DynamicOptions(Object bean, DynamicMap<DynamicBean> dynamicBeans) {
     this.bean = bean;
-    beansByPlugin = new HashMap<String, DynamicBean>();
+    beansByPlugin = new HashMap<>();
     for (String plugin : dynamicBeans.plugins()) {
       Provider<DynamicBean> provider =
           dynamicBeans.byPlugin(plugin).get(bean.getClass().getCanonicalName());