app: Fix trailing space for Author.String()
This code initially landed with lots of space:
'{name} <{email}> '
or:
'{name} '
in 3d718330 (app, help: add support for multiple authors, 2015-01-31).
The doubled space between the name and email was removed in c6592bb4
(app, help: add backwards compatibility for Authors, 2015-02-21), but
a trailing space remained in both the email and email-less cases.
This commit removes that trailing space.
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