SignInDialog: add space between login and close button

Signed-off-by: Edwin Kempin <edwin.kempin@gmail.com>

gerrit-gwtui/src/main/java/com/google/gerrit/client/auth/userpass/UserPassSignInDialog.java

@@ -149,6 +149,7 @@ public class UserPassSignInDialog extends SignInDialog {
     buttons.add(login);
 
     close = new Button();
+    DOM.setStyleAttribute(close.getElement(), "marginLeft", "45px");
     close.setText(Gerrit.C.signInDialogClose());
     close.addClickHandler(new ClickHandler() {
       @Override