refactor(:lang): redo tree-sitter hooks

- bind to major-mode-local-vars-hook instead of major mode hook
- bind the autodef tree-sitter! instead of the functions.

modules/lang/swift/config.el

@@ -34,6 +34,4 @@
 
 ;; Tree sitter
 (eval-when! (featurep! +tree-sitter)
-  (add-hook! 'swift-mode-hook
-             #'turn-on-tree-sitter-mode
-             #'+tree-sitter-keys-mode))
+  (add-hook! 'swift-mode-local-vars-hook #'tree-sitter!))