Remove Squeeze-area compatibility code.

lib/Tails/Persistence/Configuration/Atom.pm

@@ -80,11 +80,6 @@ sub options_are {
 
     return unless @expected == @options;
 
-    # all {} returns true in List::MoreUtils 0.27~04 and later.
-    # It previously did not, and Squeeze has 0.25~02, so take care
-    # of empty equal lists ourselves.
-    return 1 unless @options;
-
     all { $_ } pairwise {
         defined($a) and defined($b) and $a eq $b
     } @expected, @options;