A preferences file from before the Help Bar setting gets `help_bar` from
`status_bar` when it is read. A save that changed only the status bar
left `help_bar` out of the file, so the next start hid the Help Bar with
the status bar. A save now writes `help_bar` whenever the file lacks it,
and keeps a value another window saved.
Docs: the UI evidence list, the UI checklist and the M14 row record
Window > Help Bar.
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