Fix static tests

Author: Serhiy Zhovnir

src/com/magento/idea/magento2plugin/actions/generation/dialog/NewEmailTemplateDialog.java

@@ -91,7 +91,7 @@ public void windowClosing(final WindowEvent windowEvent) {
         // call onCancel() on ESCAPE
         contentPane.registerKeyboardAction(
                 new ActionListener() {
-                    public void actionPerformed(ActionEvent actionEvent) {
+                    public void actionPerformed(final ActionEvent actionEvent) {
                         onCancel();
                     }
                 },

src/com/magento/idea/magento2plugin/magento/files/EmailTemplateHtml.java

@@ -13,7 +13,7 @@ public class EmailTemplateHtml implements ModuleFileInterface {
     public static final String HTML_TYPE = "html";
     public static final String TEXT_TYPE = "text";
     public static final String HTML_FILE_EXTENSION = "html";
-    private static EmailTemplateHtml instance = null;
+    private static EmailTemplateHtml instance;
     private String fileName;
 
     /**

src/com/magento/idea/magento2plugin/magento/files/EmailTemplatesXml.java

@@ -19,7 +19,7 @@ public class EmailTemplatesXml implements ModuleFileInterface {
     public static final String TEMPLATE_TAG = "template";
     public static final String TEMPLATE_ID_ATTRIBUTE = "id";
 
-    private static EmailTemplatesXml instance = null;
+    private static EmailTemplatesXml instance;
 
     /**
      * Returns a new instance of the class.