programs/mercurial: add missing "less" dependency

hosts/common/programs/mercurial.nix

@@ -1,6 +1,9 @@
 { ... }:
 {
   sane.programs.mercurial = {
+    suggestedPrograms = [
+      "less"  #< TODO: this might be a missing dependency on the nix side of things?
+    ];
     sandbox.net = "clearnet";
     sandbox.whitelistPwd = true;
     sandbox.whitelistSsh = true;