t5334: document that git push --signed=1 does not work

When accepting booleans as command-line or config options throughout
Git, there are several documented synonyms for true and false.
However, one particular user is slightly broken: `git push --signed=..`
does not understand the integer synonyms for true and false.

This is hardly wanted. The --signed option has a different notion of
boolean than all other arguments and config options, including the
config option corresponding to it, push.gpgSign.

Add a test documenting the failure to handle --signed=1.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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