Fixing #574

Whoops! Good catch!

> On 29 Jun 2014, at 21:04, AliReza_Tofighi <notifications@github.com> wrote:
> 
> In admin/inc/functions_view_manager.php:
> 
> > @@ -117,9 +117,7 @@ function view_manager($base_url, $type, $fields, $sort_options=array(), $conditi
> >  		}
> >  		else
> >  		{
> > -			$mybb->input = array(
> > -				"perpage" => 20,
> > -			);
> > +			$mybb->input = array_merge(array('perpage' => 20, $mybb->input));
> It's wrong! You must use this code:
> 
> $mybb->input = array_merge(array('perpage' => 20), $mybb->input);
> —
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