Fix formatting in Couchbase smoke tests

See gh-17519

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-data-couchbase/src/main/java/smoketest/data/couchbase/User.java

@@ -59,8 +59,8 @@ public class User {
 
 	@Override
 	public String toString() {
-		return "User{id='" + this.id + '\'' + ", firstName='" + this.firstName + '\'' + ", lastName='"
+		return "User{id='" + this.id + '\'' + ", firstName='" + this.firstName + '\'' + ", lastName='" + this.lastName
-				+ this.lastName + '\'' + '}';
+				+ '\'' + '}';
 	}
 
 }