Fixes kv-test formatting. (#3860)

Author: dom96

src/workerd/api/kv-test.js

@@ -108,8 +108,8 @@ export default {
 
     response = await env.KV.get(['key1', 'key2'], {});
     expected = new Map([
-      ['key1', '{\"example\":\"values-key1\"}'],
-      ['key2', '{\"example\":\"values-key2\"}'],
+      ['key1', '{"example":"values-key1"}'],
+      ['key2', '{"example":"values-key2"}'],
     ]);
     assert.deepStrictEqual(response, expected);
 
@@ -131,7 +131,7 @@ export default {
 
     response = await env.KV.get(['key1', 'not-found'], { cacheTtl: 100 });
     expected = new Map([
-      ['key1', '{\"example\":\"values-key1\"}'],
+      ['key1', '{"example":"values-key1"}'],
       ['not-found', null],
     ]);
     assert.deepStrictEqual(response, expected);