Fixes 6807/bz1103033 - Host Collection UI rows refresh code

Previously the content host counts in the rows of host collection index table
would not get updated. So for example if the host collection had 5 CH's and 6 th on got added
the updated CH count would not get reflected in the Host Collection index page. This
commit fixes that
The hostCollection details doesn't have the table object directly available to it - you could infer from the state hierarchy that this is potentially the case, but I am always wary of these types of assumptions. Now I grant you that the way these events work they expect some sort of scope chain as well, this just feels more loosely coupled. The ideal answer would be a service IMO but in consulting with @parthaa I was trying to avoid sending him down a re-factoring hole.