refactor/Convert object to data object in sealed interface

feature/settings/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/settings/SettingsViewModel.kt

@@ -87,6 +87,6 @@ data class UserEditableSettings(
 )
 
 sealed interface SettingsUiState {
-    object Loading : SettingsUiState
+    data object Loading : SettingsUiState
     data class Success(val settings: UserEditableSettings) : SettingsUiState
 }

feature/topic/src/main/kotlin/com/google/samples/apps/nowinandroid/feature/topic/TopicViewModel.kt

@@ -177,12 +177,12 @@ private fun newsUiState(
 
 sealed interface TopicUiState {
     data class Success(val followableTopic: FollowableTopic) : TopicUiState
-    object Error : TopicUiState
+    data object Error : TopicUiState
-    object Loading : TopicUiState
+    data object Loading : TopicUiState
 }
 
 sealed interface NewsUiState {
     data class Success(val news: List<UserNewsResource>) : NewsUiState
-    object Error : NewsUiState
+    data object Error : NewsUiState
-    object Loading : NewsUiState
+    data object Loading : NewsUiState
 }