Dont play tokens on flag activity (#1145)

* don't play target tokens unless the hashcode of the activity model changes

* hide immersion mode

lib/pangea/models/space_model.dart

@@ -275,8 +275,8 @@ extension SettingCopy on ToolSetting {
       case ToolSetting.interactiveTranslator:
       case ToolSetting.interactiveGrammar:
       case ToolSetting.definitions:
-        return false;
       case ToolSetting.immersionMode:
+        return false;
       case ToolSetting.autoIGC:
         return true;
     }

lib/pangea/models/user_model.dart

@@ -141,7 +141,7 @@ class UserToolSettings {
             json[ToolSetting.interactiveTranslator.toString()] ?? true,
         interactiveGrammar:
             json[ToolSetting.interactiveGrammar.toString()] ?? true,
-        immersionMode: json[ToolSetting.immersionMode.toString()] ?? false,
+        immersionMode: false,
         definitions: json[ToolSetting.definitions.toString()] ?? true,
         autoIGC: json[ToolSetting.autoIGC.toString()] ?? true,
       );
@@ -170,9 +170,7 @@ class UserToolSettings {
                       ?.content[ToolSetting.interactiveGrammar.toString()]
                   as bool?) ??
               true,
-      immersionMode: (accountData[ToolSetting.immersionMode.toString()]
-              ?.content[ToolSetting.immersionMode.toString()] as bool?) ??
-          false,
+      immersionMode: false,
       definitions: (accountData[ToolSetting.definitions.toString()]
               ?.content[ToolSetting.definitions.toString()] as bool?) ??
           true,

lib/pangea/widgets/practice_activity/multiple_choice_activity.dart

@@ -53,17 +53,8 @@ class MultipleChoiceActivityState extends State<MultipleChoiceActivity> {
   @override
   void didUpdateWidget(covariant MultipleChoiceActivity oldWidget) {
     super.didUpdateWidget(oldWidget);
-    if (currentRecordModel?.responses.isEmpty ?? false) {
-      // This gets triggered when the activity switches and when the activity is
-      // flagged. Only want to speak the target tokens when the activity switches.
-      final activityEventFuture =
-          widget.practiceCardController.currentActivityCompleter?.future;
-
-      activityEventFuture?.then((event) {
-        final redacted = event?.event.redacted ?? false;
-        if (mounted && !redacted) speakTargetTokens();
-      });
-
+    if (widget.currentActivity.hashCode != oldWidget.currentActivity.hashCode) {
+      speakTargetTokens();
       setState(() => selectedChoiceIndex = null);
     }
   }