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/editor/src/editor_settings.rs

@@ -176,7 +176,7 @@ impl ScrollbarVisibility for EditorSettings {
 }
 
 impl Settings for EditorSettings {
-    fn from_settings(content: &settings::SettingsContent) -> Self {
+    fn from_settings(content: &settings::SettingsContent, _cx: &mut App) -> Self {
         let editor = content.editor.clone();
         let scrollbar = editor.scrollbar.unwrap();
         let minimap = editor.minimap.unwrap();