debian: Move stage param to the top

By putting it at the end, the params may fall out of order if one of the other params has “undef” as its value.

manifests/os/debian.pp

@@ -42,9 +42,9 @@ class base::os::debian (
     before => Stage['main'],
   }
   class { 'base::os::debian::apt':
+    stage               => 'aptitude',
     apt_cache_notin_tmp => $apt_cache_notin_tmp,
     apt_cache_tmp_dir   => $apt_cache_tmp_dir,
-    stage               => 'aptitude',
   }
 
   # Install basic configuration files.