phabricator: use True primitive instead of b'true' for phabupdate actions
Something I'd missed in the creatediff port. This didn't matter before with
the old PHP form style wireformat, but breaks with the new arcanist format.
Differential Revision: https://phab.mercurial-scm.org/D7152
Mercurial
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Mercurial is a fast, easy to use, distributed revision control tool
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$ hg debuginstall # sanity-check setup
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