Fix the broken metrics feature

Summary:
The metrics feature got broken in this D16280167, due to a review change.

```
+  if (!selectedPlugins.includes(pluginName)) {

-  if (selectedPlugins.length > 0 && !selectedPlugins.includes(pluginName)) {
```

Reviewed By: jknoxville

Differential Revision: D16379959

fbshipit-source-id: ab1c4caf56a55bd97f1299822d6fa4331815c569

src/utils/exportMetrics.js

@@ -27,7 +27,7 @@ async function exportMetrics(
     const pluginStateData = pluginStates[key];
     const arr = key.split('#');
     const pluginName = arr.pop();
-    if (!selectedPlugins.includes(pluginName)) {
+    if (selectedPlugins.length > 0 && !selectedPlugins.includes(pluginName)) {
       continue;
     }
     const clientID = arr.join('#');