Initialized features cannot be disabled

If a feature string is initialized in the `Feature` widget:
```
return Features(
flags: [FEATURE_ADS],
child: MaterialApp(
```

Then I add a `DebugFeatures` somewhere in the app:
```
...
ElevatedButton(
onPressed: (){
DebugFeatures.show(
context,
availableFeatures: [
Feature(FEATURE_ADS, name: 'Advertisements'),
Feature(FEATURE_PAID, name: 'Paid functions'),
],
);
},
child: Text("Feature Flag Debug"),
)

```

The I cannot change the already initialized feature, it will always stay active, no matter if I click on it.

If I try to programmatically disable it, it also won't work.

```

ElevatedButton(
onPressed: (){
Features.setFeature(
context,
FEATURE_ADS,
false,
);

DebugFeatures.show(
context,
availableFeatures: [
Feature(FEATURE_ADS, name: 'Advertisements'),
Feature(FEATURE_PAID, name: 'Paid functions'),
],
);
},
child: Text("Feature Flag Debug"),
)
```