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/project/src/project_settings.rs

@@ -4,7 +4,7 @@ use context_server::ContextServerCommand;
 use dap::adapters::DebugAdapterName;
 use fs::Fs;
 use futures::StreamExt as _;
-use gpui::{AsyncApp, BorrowAppContext, Context, Entity, EventEmitter, Subscription, Task};
+use gpui::{App, AsyncApp, BorrowAppContext, Context, Entity, EventEmitter, Subscription, Task};
 use lsp::LanguageServerName;
 use paths::{
     EDITORCONFIG_NAME, local_debug_file_relative_path, local_settings_file_relative_path,
@@ -437,7 +437,7 @@ pub struct LspPullDiagnosticsSettings {
 }
 
 impl Settings for ProjectSettings {
-    fn from_settings(content: &settings::SettingsContent) -> Self {
+    fn from_settings(content: &settings::SettingsContent, _cx: &mut App) -> Self {
         let project = &content.project.clone();
         let diagnostics = content.diagnostics.as_ref().unwrap();
         let lsp_pull_diagnostics = diagnostics.lsp_pull_diagnostics.as_ref().unwrap();