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/client/src/client.rs

@@ -101,7 +101,7 @@ pub struct ClientSettings {
 }
 
 impl Settings for ClientSettings {
-    fn from_settings(content: &settings::SettingsContent) -> Self {
+    fn from_settings(content: &settings::SettingsContent, _cx: &mut App) -> Self {
         if let Some(server_url) = &*ZED_SERVER_URL {
             return Self {
                 server_url: server_url.clone(),
@@ -133,7 +133,7 @@ impl ProxySettings {
 }
 
 impl Settings for ProxySettings {
-    fn from_settings(content: &settings::SettingsContent) -> Self {
+    fn from_settings(content: &settings::SettingsContent, _cx: &mut App) -> Self {
         Self {
             proxy: content.proxy.clone(),
         }
@@ -519,7 +519,7 @@ pub struct TelemetrySettings {
 }
 
 impl settings::Settings for TelemetrySettings {
-    fn from_settings(content: &SettingsContent) -> Self {
+    fn from_settings(content: &SettingsContent, _cx: &mut App) -> Self {
         Self {
             diagnostics: content.telemetry.as_ref().unwrap().diagnostics.unwrap(),
             metrics: content.telemetry.as_ref().unwrap().metrics.unwrap(),