Mark Worker name option as available under android_webview (#22846)

This was originally added as unavailable back in 2018 (#3049).  However,
testing using the android webview shell shows that it is working fine.

The test I used was:

```
new Worker(URL.createObjectURL(new Blob(["console.log('my name is ' + self.name)"], {type: 'application/javascript'})), {name: "foo"})
```

I ran this is DevTools and it printed `my name is foo`.

api/Worker.json

@@ -238,9 +238,7 @@
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
-              "webview_android": {
-                "version_added": false
-              }
+              "webview_android": "mirror"
             },
             "status": {
               "experimental": false,