Move all default settings from source code into the JSON file

crates/editor/src/display_map.rs

@@ -983,7 +983,7 @@ pub mod tests {
         language.set_theme(&theme);
         cx.update(|cx| {
             let mut settings = Settings::test(cx);
-            settings.language_settings.tab_size = Some(2.try_into().unwrap());
+            settings.editor_defaults.tab_size = Some(2.try_into().unwrap());
             cx.set_global(settings);
         });
 

crates/editor/src/editor.rs

@@ -7613,7 +7613,7 @@ mod tests {
         let mut cx = EditorTestContext::new(cx).await;
         cx.update(|cx| {
             cx.update_global::<Settings, _, _>(|settings, _| {
-                settings.language_settings.hard_tabs = Some(true);
+                settings.editor_overrides.hard_tabs = Some(true);
             });
         });