test(condition): ensure module is included in the default conditions

This causes these tests to fail in vite 6 without this change since we were passing ['node'] and overwriting the defaults which were essentially ['module', 'node', 'development|production'] before.

test/config/fixtures/conditions-subpackage/package.json

@@ -4,10 +4,12 @@
   "type": "module",
   "exports": {
     ".": {
-      "custom": "./custom.js",
-      "development": "./development.js",
-      "production": "./production.js",
-      "default": "./default.js"
+      "module": {
+        "custom": "./custom.js",
+        "development": "./development.js",
+        "production": "./production.js",
+        "default": "./default.js"
+      }
     }
   }
 }