Revert "Remove cx from ThemeSettings (#38836)" (#39691)

This reverts commit a2a7bd139a.

This caused themes to not load correctly on startup, you needed to edit
your settings.

Release Notes:

- N/A

crates/collab/src/tests/editor_tests.rs

@@ -2041,10 +2041,6 @@ async fn test_mutual_editor_inlay_hint_cache_update(
     });
 }
 
-// This test started hanging on seed 2 after the theme settings
-// PR. The hypothesis is that it's been buggy for a while, but got lucky
-// on seeds.
-#[ignore]
 #[gpui::test(iterations = 10)]
 async fn test_inlay_hint_refresh_is_forwarded(
     cx_a: &mut TestAppContext,

crates/collab/src/tests/randomized_test_helpers.rs

@@ -183,10 +183,9 @@ pub async fn run_randomized_test<T: RandomizedTest>(
 
     for (client, cx) in clients {
         cx.update(|cx| {
-            let settings = cx.remove_global::<SettingsStore>();
+            let store = cx.remove_global::<SettingsStore>();
             cx.clear_globals();
-            cx.set_global(settings);
-            theme::init(theme::LoadThemes::JustBase, cx);
+            cx.set_global(store);
             drop(client);
         });
     }

crates/collab/src/tests/test_server.rs

@@ -172,7 +172,6 @@ impl TestServer {
             }
             let settings = SettingsStore::test(cx);
             cx.set_global(settings);
-            theme::init(theme::LoadThemes::JustBase, cx);
             release_channel::init(SemanticVersion::default(), cx);
             client::init_settings(cx);
         });