Correct subplot update

Author: VeraZab

src/components/fields/AxisCreator.js

@@ -47,7 +47,11 @@ export class UnconnectedAxisCreator extends Component {
                 context.onUpdate({
                   type: EDITOR_ACTIONS.UPDATE_LAYOUT,
                   payload: {
-                    update: {[`${subplot}.side`]: 'right'},
+                    update: {
+                      [`${subplot +
+                        (context.fullLayout._subplots[subplot].length +
+                          1)}.side`]: 'right',
+                    },
                   },
                 });
               }