test: fix restart-emacs no-service mock to survive native-comp

test-system-cmd-restart-emacs-no-service-aborts mocked cj/system-cmd--emacs-service-available-p directly, but cj/system-cmd-restart-emacs reaches that helper through a native-comp intra-file direct call that bypasses the symbol-function redefinition. The mock silently no-opped, the real check ran, and on any machine that has emacs.service it returned non-nil, so restart proceeded and the should-error saw no error.

I mock executable-find to nil instead, driving the real helper to nil at a boundary its subr trampoline honors, matching the passing sibling tests. The test now passes whether or not emacs.service is installed.

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