Bug 19839: Removed Warning (invoice.pl - uncertainprices)

Test Plan
[1.] Check the patch to see that I have removed:
$template->param( uncertainprices => 1 ); from line 204 as Mr Druart has instructed to do
(to get to the patch see the comment above by Mr Druart)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

acqui/invoice.pl

@@ -201,7 +201,6 @@ sub get_infos {
     $line{budget_name}    = $budget->{budget_name};
 
     if ( $line{uncertainprice} ) {
-        $template->param( uncertainprices => 1 );
         $line{rrp} .= ' (Uncertain)';
     }
     if ( $line{'title'} ) {