Fix issue 2265

#339 introduced the bug reported in [issue 2265](https://code.google.com/p/ankidroid/issues/detail?id=2265). 

I agree that it would be nice to allow adding cards to the currently selected deck in the browser (although Anki Desktop doesn't do this)... I considered passing an argument for selected did to the note editor via intent, but in that case we need to manually figure out the default model which is a bit messy, so for now just reverting #339.