[mythtv] mythweb 0.20fixes and konqueror

[Chris Petersen]

> It appears that the onchange method of checkbox gets called on initialise.  
> Because of this set_autoexpire is called for each program.  This causes the 
> http://azeroth.lan/mythweb/tv/recorded page to load very slowly, stop earily 
> or hang konqueror.

Submitting a ticket would be the better way to handle this.  However,
Konqueror must be broken, since this works fine in other browsers, and
onchange should *not* fire for the default values.

-Chris

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