formatEditorSelection indents regions outside selected

When using `MBeautify.formatEditorSelection()`, after formatting the selected text, [MBeautify.m#L227](https://github.com/davidvarga/MBeautifier/blob/1a57849e44662f56271dc0eefa746855698a719a/MBeautify.m#L227) then indents the entire editor page, rather than just the selection. I.e. the following code is called:
```
MBeautify.indentPage(currentEditorPage, configuration);
```

It would seem more appropriate to indent only the selected region.