Revert "temp: temp switch the dns servers since the recent changes left them unavailable"

This reverts commit 4fc1071225.

machines/vendetta.nix

@@ -45,7 +45,7 @@ in {
       server = {
         enable = true;
         # primary dns server (ns1)
-        primary = false;
+        primary = true;
         ip = ip_pub;
       };
     };

machines/vigil.nix

@@ -41,7 +41,7 @@ in {
       server = {
         enable = true;
         # secondary dns server (ns2)
-        primary = true;
+        primary = false;
         ip = ip_pub;
       };
     };