Reorder functions in impl Repo for MutableRepo to match trait

This is just a clean-up to silence a lint that complains that the functions are
defined in a different order than they are in the trait.

lib/src/repo.rs

@@ -1370,15 +1370,15 @@ impl Repo for MutableRepo {
         self.index.as_index()
     }
 
-    fn submodule_store(&self) -> &Arc<dyn SubmoduleStore> {
-        self.base_repo.submodule_store()
-    }
-
     fn view(&self) -> &View {
         self.view
             .get_or_ensure_clean(|v| self.enforce_view_invariants(v))
     }
 
+    fn submodule_store(&self) -> &Arc<dyn SubmoduleStore> {
+        self.base_repo.submodule_store()
+    }
+
     fn resolve_change_id_prefix(&self, prefix: &HexPrefix) -> PrefixResolution<Vec<CommitId>> {
         let change_id_index = self.index.change_id_index(&mut self.view().heads().iter());
         change_id_index.resolve_prefix(prefix)