When I visit a new file with clojure-ts-mode it doesn't insert the ns form

I am unsure whether this is blocked by #117.

I see clojure-mode uses
```
(setq-local clojure-expected-ns-function #'clojure-expected-ns)
```

after which `(clojure-insert-ns-form)` works. But not for clojure-ts-mode.