Add duration parameter to muting. (#13831)

* Adding duration to muting.

* Remove useless checks

app/javascript/mastodon/reducers/mutes.js

@@ -3,12 +3,14 @@ import Immutable from 'immutable';
 import {
   MUTES_INIT_MODAL,
   MUTES_TOGGLE_HIDE_NOTIFICATIONS,
+  MUTES_CHANGE_DURATION,
 } from '../actions/mutes';
 
 const initialState = Immutable.Map({
   new: Immutable.Map({
     account: null,
     notifications: true,
+    duration: 0,
   }),
 });
 
@@ -21,6 +23,8 @@ export default function mutes(state = initialState, action) {
     });
   case MUTES_TOGGLE_HIDE_NOTIFICATIONS:
     return state.updateIn(['new', 'notifications'], (old) => !old);
+  case MUTES_CHANGE_DURATION:
+    return state.setIn(['new', 'duration'], Number(action.duration));
   default:
     return state;
   }