ids.cgi: Remove etag data when deleting a provider.

Otherwise the same provider could not be added again at a later
time if the stored etag is still valid.

In this case the server will not offer the rules and the provider
could not be added.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>

html/cgi-bin/ids.cgi

@@ -906,6 +906,9 @@ if ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 	# Drop the stored ruleset file.
 	&IDS::drop_dl_rulesfile($provider);
 
+	# Remove may stored etag data.
+	&IDS::remove_from_etags($provider);
+
 	# Get the name of the provider rulessets include file.
 	my $provider_used_rulefile = &IDS::get_provider_used_rulesfiles_file($provider);