MT#60611 helper/del-value: Delete misplaced APPEND handling

The handling for the APPEND pseudo-action comes from the set-value code,
but it does not make sense in the del-value code, where we are trying to
remove a value and not add one.

Change-Id: I6937abcde0f9c0e55c334ca24f9ecb879f00f4be

helper/del-value

@@ -31,9 +31,6 @@ for my $component (@path) {
     elsif (looks_like_number($component) && (! defined(${$valref}) || ref(${$valref}) eq 'ARRAY')) {
         $valref = \${$valref}->[$component];
     }
-    elsif ($component eq 'APPEND' && ref($$valref) eq 'ARRAY') {
-        $valref = \${$valref}->[$#{$$valref}+1];
-    }
     elsif (! defined(${$valref}) || ref(${$valref}) eq 'HASH') {
         $valref = \${$valref}->{$component};
     }