Bug: right drawer on Android isn't shown (#569)

https://github.com/wix/react-native-navigation/issues/297

android/app/src/main/java/com/reactnativenavigation/layouts/SingleScreenLayout.java

@@ -47,7 +47,7 @@ public class SingleScreenLayout extends RelativeLayout implements Layout {
     }
 
     private void createLayout() {
-        if (leftSideMenuParams == null) {
+        if (leftSideMenuParams == null && rightSideMenuParams == null) {
             createStack(getScreenStackParent());
         } else {
             sideMenu = createSideMenu();