Unable to configure settings in provideRemoteConfig

### Version info

**Angular:**
^12.2.9

**Firebase:**
^9.1.2

**AngularFire:**
^7.1.0

**Other (e.g. Ionic/Cordova, Node, browser, operating system):**

"rxfire": "^6.0.2",
"rxjs": "^6.6.7",

Node LTS (14)
npm@6

### How to reproduce these conditions

**Failing test unit, Stackblitz demonstrating the problem**

**Steps to set up and reproduce**

Copy the following code in the `imports` modules of `AppModule`:

```ts
provideFirebaseApp(() => initializeApp(environment.firebase)),
provideAuth(() => getAuth()),
provideMessaging(() => getMessaging()),
provideAnalytics(() => getAnalytics()),
provideRemoteConfig(() => {
console.log('provideRemoteConfig')
const remoteConfig = getRemoteConfig();

if (isDevMode()) {
console.log('isDevMode')
remoteConfig.settings.minimumFetchIntervalMillis = 10 * 1000;
}

return remoteConfig;
}),
```

### Expected behavior

It should run the code (console.log, etc...) and set the fetch time in dev env.

### Actual behavior

Currently, it does nothing (no console output) and it's really hard to work with Remote Config since it's 12 hours throttle update with default settings...

Reproduza o problema com o snippet de AppModule e rastreie o ponto de entrada de provideRemoteConfig junto com as outras funções de provider. Verifique por que o callback não registra nada nem aplica minimumFetchIntervalMillis e, em seguida, confirme que o callback é executado e que o intervalo de busca de desenvolvimento é aplicado.

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