SetParent: Simplify lambda expression

SonarLint reports:

Lambdas containing only one statement should not nest this statement
in a block (squid:S1602).

Change-Id: If42c79c135ba0639e1ff6e352e6a72252efc6d77

java/com/google/gerrit/server/restapi/project/SetParent.java

@@ -161,12 +161,7 @@ public class SetParent
         throw new ResourceConflictException("cannot set parent to self");
       }
 
-      if (Iterables.tryFind(
-              parent.tree(),
-              p -> {
-                return p.getNameKey().equals(project);
-              })
-          .isPresent()) {
+      if (Iterables.tryFind(parent.tree(), p -> p.getNameKey().equals(project)).isPresent()) {
         throw new ResourceConflictException(
             "cycle exists between " + project.get() + " and " + parent.getName());
       }