[fix bug 910770] Not all selected nominees are saved for a rangepoll vot...

Taken a pop at fixing this one: 

The bug seems to occur when there are over 10 objects in a form set, due to the attribute strings being concatenated incorrectly given the change in length to `total_forms_obj.val()`.

This PR should fix it, while not breaking the functionality to allow for multiple range poll instances.

Needs testing! (on every page this function is used).