Rename cx.global_default_mut to cx.global_default

crates/project2/src/project_settings.rs

@@ -41,7 +41,7 @@ impl Setting for ProjectSettings {
     fn load(
         default_value: &Self::FileContent,
         user_values: &[&Self::FileContent],
-        _: &AppContext,
+        _: &mut AppContext,
     ) -> anyhow::Result<Self> {
         Self::load_via_json_merge(default_value, user_values)
     }