Xiretza ba0bfb9df7 functions: list caller-exit handlers correctly
`functions --handlers-type caller-exit` did not list any functions, while
`functions --handlers-type process-exit` listed both process-exit and
caller-exit handlers:

$ echo (function foo --on-job-exit caller; end; functions --handlers-type caller-exit | grep foo)

$ echo (function foo --on-job-exit caller; end; functions --handlers-type process-exit | grep foo)
caller-exit foo
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