fix(users): use updateAsync for Meteor 3 server-side user writes

Meteor.users.update() is sync-only and no longer exists server-side
under Meteor 3, so it threw on every call, surfacing as a generic
500 to the client. users.setLang runs on every page load for logged-in
users, which is what broke /zones; the same bug in edit-profile.js
was silently breaking /profile too.

imports/api/Users/server/edit-profile.js

@@ -4,9 +4,9 @@ import { Meteor } from 'meteor/meteor';
 
 let action;
 
-const updateUser = (userId, { emailAddress, profile }) => {
+const updateUser = async (userId, { emailAddress, profile }) => {
   try {
-    Meteor.users.update(userId, {
+    await Meteor.users.updateAsync(userId, {
       $set: {
         'emails.0.address': emailAddress,
         profile,
@@ -17,10 +17,10 @@ const updateUser = (userId, { emailAddress, profile }) => {
   }
 };
 
-const editProfile = ({ userId, profile }, promise) => {
+const editProfile = async ({ userId, profile }, promise) => {
   try {
     action = promise;
-    updateUser(userId, profile);
+    await updateUser(userId, profile);
     action.resolve();
   } catch (exception) {
     action.reject(`[editProfile.handler] ${exception}`);

imports/api/Users/server/methods.js

@@ -33,9 +33,9 @@ Meteor.methods({
         throw new Meteor.Error('500', exception);
       });
   },
-  'users.setLang': function userLang(lang) {
+  'users.setLang': async function userLang(lang) {
     check(lang, validLangCode);
-    Meteor.users.update({ _id: this.userId }, { $set: { lang } });
+    await Meteor.users.updateAsync({ _id: this.userId }, { $set: { lang } });
   },
   'auth.getHash': async function getHash() {
     const token = Accounts._generateStampedLoginToken();