Fix “wrong number of arguments” error

[claui]

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• Have you successfully run brew tests with your changes locally? Seven failing tests locally but none of them seem related.

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This PR fixes an error introduced in #8187, which would surface on certain brew install/brew reinstall/brew upgrade failures.

Example:

==> Patching
patching file default_out.txt
Hunk #2 FAILED at 11.
1 out of 2 hunks FAILED -- saving rejects to file default_out.txt.rej
Error: wrong number of arguments (given 3, expected 2)
/usr/local/Homebrew/Library/Homebrew/reinstall.rb:77:in `restore_backup'
/usr/local/Homebrew/Library/Homebrew/reinstall.rb:52:in `block in reinstall_formula'
/usr/local/Homebrew/Library/Homebrew/utils.rb:377:in `ignore_interrupts'
/usr/local/Homebrew/Library/Homebrew/reinstall.rb:52:in `rescue in reinstall_formula'
/usr/local/Homebrew/Library/Homebrew/reinstall.rb:10:in `reinstall_formula'
/usr/local/Homebrew/Library/Homebrew/cmd/reinstall.rb:71:in `block in reinstall'
/usr/local/Homebrew/Library/Homebrew/cmd/reinstall.rb:65:in `each'
/usr/local/Homebrew/Library/Homebrew/cmd/reinstall.rb:65:in `reinstall'
/usr/local/Homebrew/Library/Homebrew/brew.rb:112:in `<main>'

[MikeMcQuaid]

Thanks @claui!