FIX: Make Subsites work correctly with ChangeTracker ignoreFieldSelector option

Currently the `getChangeTrackerOptions` method is used to overload the `ignoreFieldSelector`. However this doesn't pull through the value from `LeftAndMain.EditForm.js` so it is necessary to redeclare it.

I've done it this way because I couldn't figure out a decent way to use the `getChangeTrackerOptions` method. That being said I'm not an entwine/js expert so am happy to be shown a better way of fixing this.