stories: muted by default, muted on app blur

ts/state/ducks/items.ts

@@ -91,7 +91,6 @@ export const actions = {
   removeItem,
   removeItemExternal,
   resetItems,
-  toggleHasAllStoriesMuted,
 };
 
 export const useActions = (): typeof actions => useBoundActions(actions);
@@ -112,19 +111,6 @@ function onSetSkinTone(tone: number): ItemPutAction {
   return putItem('skinTone', tone);
 }
 
-function toggleHasAllStoriesMuted(): ThunkAction<
-  void,
-  RootStateType,
-  unknown,
-  ItemPutAction
-> {
-  return (dispatch, getState) => {
-    const hasAllStoriesMuted = Boolean(getState().items.hasAllStoriesMuted);
-
-    dispatch(putItem('hasAllStoriesMuted', !hasAllStoriesMuted));
-  };
-}
-
 function putItemExternal(key: string, value: unknown): ItemPutExternalAction {
   return {
     type: 'items/PUT_EXTERNAL',