test(org-capture): cover the popup neutralize guards

The guards from the previous commit landed without tests. I added ten: eviction of a stray live buffer to *scratch*, capture UI spared (*Org Select*, CAPTURE-*), idempotence on a window already showing *scratch*, non-popup frames untouched, nil and non-frame inputs ignored, both hook wrappers' dispatch, and hook registration.

The tests drive the real batch frame instead of mocking frame primitives: they rename it to "org-capture", exercise the guard, and revert to auto-naming. The revert must be nil, not the saved name, because Emacs refuses to set F<num>-shaped names explicitly. window-buffer-change-functions only runs during redisplay, so the module's own hook can't fire mid-test in batch.

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