filemerge: only write in-memory backup during premerge
This wasn't broken, but should mirror the non-in memory case to save an extra write. Differential Revision: https://phab.mercurial-scm.org/D1807
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This instance will be upgraded to Heptapod 17.9.0rc1 on 2025-03-27 between 17:00 and 18:00 UTC+2
This wasn't broken, but should mirror the non-in memory case to save an extra write. Differential Revision: https://phab.mercurial-scm.org/D1807