aptly: Fix incorrect sub signature for aptlyctl

The signature only specified one argument, leading to inability
to pass anything else to the sub. Revert the signature addition,
instead use the traditional "shift" to make sure variadic arguments
work as expected.

Fixes: ea7734c6 ("aptly: Detect errors only where needed")
Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

src/backend/BSAptly.pm

@@ -110,7 +110,8 @@ sub check_exit_code {
   return $child_exit_code == 0;
 }
 
-sub aptlyctl($aptly_server) {
+sub aptlyctl {
+  my $aptly_server = shift;
   return check_exit_code(api_tool_exec($aptly_server, 'aptlyctl', @_));
 }