Fix the offline ns sort doing nothing in clojure-ts-mode

[bbatsov]

In a clojure-ts-mode buffer the offline ns-form sort (cljr-clean-ns without a REPL, and cljr-auto-sort-ns) reported success while changing nothing: clojure-ts-mode's tree-sitter forward-sexp-function silently breaks clojure-sort-ns's syntax-table-based walk. Force the default sexp movement around the sort - the same idiom clojure-mode uses internally in clojure-forward-logical-sexp. The proper fix probably belongs in clojure-sort-ns itself; this shields our call sites until that lands.

Verified in a live clojure-ts-mode buffer (with the grammar installed); the test simulates the hostile forward-sexp-function since CI has no tree-sitter grammars.

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