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filemerge: stop passing around 3 unused `None` values in `files` argument

Authored by martinvonz.

Description

filemerge: stop passing around 3 unused None values in files argument

Since 67cfffbfb6a0 (filemerge: eliminate most uses of tempfiles,
2017-08-31), we have used only the last entry in the files tuple
that gets passed around to various functions. That commit said
"Emphasize that they're unused so we can more easily remove them
later.". It's now "later".

Differential Revision: https://phab.mercurial-scm.org/D11877