fiji_scripts: fix deletion of FIU elements in fiji_setup.pl

Tk/FIJISettingsViewer.pm

@@ -105,10 +105,10 @@ sub update {
     '-columnspan' => 2,
   );
 
-  my $fiu_cnt = _fiu_cnt();
+  my $fiu_cnt = $self->_fiu_cnt();
   for (my $i = 0; $i < $fiu_cnt; $i++) {
     my $fiu = @{${$self->{'settings'}}->{'FIUs'}}[$i];
-    _add_fiu($fiu, $i);
+    $self->_add_fiu($fiu, $i);
   }
 
 }
@@ -239,7 +239,7 @@ sub _fiu_cnt {
 
 
 sub _add_fiu ($$) {
-  my($self, $i, $fiu) = @_;
+  my($self, $fiu, $i) = @_;
   if (!defined($i)) {
     $i = $self->_fiu_cnt(); # default is to append
   }