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/language_models/src/settings.rs

@@ -36,7 +36,7 @@ pub struct AllLanguageModelSettings {
 impl settings::Settings for AllLanguageModelSettings {
     const PRESERVED_KEYS: Option<&'static [&'static str]> = Some(&["version"]);
 
-    fn from_settings(content: &settings::SettingsContent) -> Self {
+    fn from_settings(content: &settings::SettingsContent, _cx: &mut App) -> Self {
         let language_models = content.language_models.clone().unwrap();
         let anthropic = language_models.anthropic.unwrap();
         let bedrock = language_models.bedrock.unwrap();