lisp/ido.el: Respect completion-auto-help setting

This commit makes ido completion respect the user's setting for
`completion-auto-help' by default.  It does this by defining a wrapper
function `ido-completion-auto-help', which calls `ido-completion-help'
only when `completion-auto-help' is non-nil.

* lisp/ido.el (ido-completion-auto-help): New function.
Use it as the new default (bug#41340).
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passed #6048