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This fixes bug#38458 where a final `point` in the pattern prevented
the expected normal behavior of point moving after the completion
of the final implicit `any`.

(completion-pcm--find-all-completions)
(completion-substring--all-completions): Use it.
(completion-basic--pattern): Don't both removing "" any more.
(completion-basic-try-completion): Use it as well as
`completion-basic--pattern`.