pinwheel: Correct misspellning in go module enable option

hosts/pinwheel/modules/go/default.nix

@@ -5,7 +5,7 @@ in
 {
   options = {
     mod.go = {
-      enable = lib.mkEnableOption "enable openpn module";
+      enable = lib.mkEnableOption "enable go module";
     };
   };