Cleanup fenixbook

hosts/fenixbook/default.nix

@@ -67,12 +67,7 @@ in
       ];
     });
 
-    groups = {
+    groups = lib.genAttrs users (user: {
-      i2c = {
-        members = users;
-      };
-    }
-    // lib.genAttrs users (user: {
       members = [
         user
       ];