fix(#59): typeerror - default is not a function

We're shipping both `./dist/vitest-fail-on-console.es.js` and `./dist/vitest-fail-on-console.umd.js` with "type": "module".
Since Vitest only runs `esm` in the test environment (doesn't use require), we can only ship the default export as `./dist/vitest-fail-on-console.es.js`

Thanks to @hi-ogawa - vitest-dev/vitest#6352 (comment)

package.json

@@ -30,9 +30,8 @@
   ],
   "exports": {
     ".": {
-      "import": "./dist/vitest-fail-on-console.es.js",
-      "require": "./dist/vitest-fail-on-console.umd.js",
-      "types": "./dist/index.d.ts"
+      "types": "./dist/index.d.ts",
+      "default": "./dist/vitest-fail-on-console.es.js"
     }
   },
   "types": "./dist/index.d.ts",