Bug 19989: remove confusing variable

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

opac/opac-memberentry.pl

@@ -272,7 +272,7 @@ elsif ( $action eq 'update' ) {
             $borrower_changes{borrowernumber} = $borrowernumber;
             $borrower_changes{extended_attributes} = to_json($extended_attributes_changes);
 
-            my $patron_modifications = Koha::Patron::Modifications->search({ borrowernumber => $borrowernumber })->delete;
+            Koha::Patron::Modifications->search({ borrowernumber => $borrowernumber })->delete;
 
             my $m = Koha::Patron::Modification->new( \%borrower_changes )->store();