Use UpdateGlobal accessors in more places (#11925)

This PR updates a number of instances that were previously using
`cx.update_global` to use `UpdateGlobal::update_global` instead.

Release Notes:

- N/A

crates/settings/src/settings_file.rs

@@ -2,7 +2,7 @@ use crate::{settings_store::SettingsStore, Settings};
 use anyhow::{Context, Result};
 use fs::Fs;
 use futures::{channel::mpsc, StreamExt};
-use gpui::{AppContext, BackgroundExecutor, BorrowAppContext};
+use gpui::{AppContext, BackgroundExecutor, UpdateGlobal};
 use std::{io::ErrorKind, path::PathBuf, sync::Arc, time::Duration};
 use util::{paths, ResultExt};
 
@@ -70,7 +70,7 @@ pub fn handle_settings_file_changes(
         .background_executor()
         .block(user_settings_file_rx.next())
         .unwrap();
-    cx.update_global(|store: &mut SettingsStore, cx| {
+    SettingsStore::update_global(cx, |store, cx| {
         store
             .set_user_settings(&user_settings_content, cx)
             .log_err();

crates/settings/src/settings_store.rs

@@ -1,6 +1,6 @@
 use anyhow::{anyhow, Context, Result};
 use collections::{btree_map, hash_map, BTreeMap, HashMap};
-use gpui::{AppContext, AsyncAppContext, BorrowAppContext, Global};
+use gpui::{AppContext, AsyncAppContext, BorrowAppContext, Global, UpdateGlobal};
 use lazy_static::lazy_static;
 use schemars::{gen::SchemaGenerator, schema::RootSchema, JsonSchema};
 use serde::{de::DeserializeOwned, Deserialize as _, Serialize};
@@ -49,7 +49,7 @@ pub trait Settings: 'static + Send + Sync {
     where
         Self: Sized,
     {
-        cx.update_global(|store: &mut SettingsStore, cx| {
+        SettingsStore::update_global(cx, |store, cx| {
             store.register_setting::<Self>(cx);
         });
     }