sidedata: adjust string for python3
This was pointed out by Gregory Szorc: Python 3 will require a r'' because of source transformation. Differential Revision: https://phab.mercurial-scm.org/D6968
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This was pointed out by Gregory Szorc: Python 3 will require a r'' because of source transformation. Differential Revision: https://phab.mercurial-scm.org/D6968