Add default value for newArchitectureEnabled param

Summary:
Add default value for newArchitectureEnabled param

changelog: [internal] internal

Differential Revision: D61621224

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/internal/featureflags/ReactNativeNewArchitectureFeatureFlagsDefaults.kt

@@ -14,7 +14,7 @@ import com.facebook.react.config.ReactFeatureFlags
  * com.facebook.react.config.ReactFeatureFlags} when newArchitectureEnabled is true.
  */
 public open class ReactNativeNewArchitectureFeatureFlagsDefaults(
-    private val newArchitectureEnabled: Boolean
+    private val newArchitectureEnabled: Boolean = true
 ) : ReactNativeFeatureFlagsDefaults() {
 
   init {