style: format code with Google Java Format and StandardJS

This commit fixes the style issues introduced in 7febd3b according to the output
from Google Java Format and StandardJS.

Details: None

src/main/java/io/hardingadonis/saledock/controller/Controller.java

@@ -1,5 +1,3 @@
 package io.hardingadonis.saledock.controller;
 
-public class Controller {
-
-}
+public class Controller {}

src/main/java/io/hardingadonis/saledock/model/Model.java

@@ -1,5 +1,3 @@
 package io.hardingadonis.saledock.model;
 
-public class Model {
-
-}
+public class Model {}

src/main/java/io/hardingadonis/saledock/utils/Utils.java

@@ -1,5 +1,3 @@
 package io.hardingadonis.saledock.utils;
 
-public class Utils {
-
-}
+public class Utils {}