request-pull: pick up tag message as before

The previous two steps were meant to stop updating the explicit
refname the user gave to the command to a different ref that points
at it.  Most notably, we no longer substitute a branch name the user
used with a name of the tag that points at the commit at the tip of
the branch (it still can be done with "local-branch:remote-tag").

However, they also lost the code that included the message in a
tag when the user _did_ ask the tag to be pulled.  Resurrect it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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