The message displayed when proc_open is not available could be better [#3511959]

Problem/Motivation

I've been setting up Drupal CMS on cheap hosting (hostinger) to see if I can use it for unattended updates for a hobby site. The web hosting disables proc_open by default but does allow me to enable it via their web UI. The error message in the system report is not useful because of a bug in the code.

Steps to reproduce

Disable proc_open.

Proposed resolution

Fix the message.

Remaining tasks

User interface changes

Better message if proc_open is disabled.

API changes

None

Data model changes

None

Issue fork automatic_updates-3511959

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3511959-proc_open-message changes, plain diff MR !1101
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