[collectd] collection4 nitpicking

[Trent W. Buck]

Trent W. Buck wrote:
> I've just replaced collection 3 with collection 4.0.0+34, and on the
> whole I am impressed.

Regardless of the current method and interval, the buttons on the RHS
default to JS and Hour on every page.  Since the actual default in the
rest of the system seems to be Day, this is a little confusing.

I think it should "remember", e.g. when responding to a request for
RRDTool/Month, it should send a page that sets the default radio and
drop box options to RRDTool and Month.