Denton Liu authored Apr 01, 2021 and Daniel M. Capella committed Jul 27, 2021

In 19ab4fac (pacdiff: Add option to use sudo/sudoedit to manage files,
2021-03-27), pacdiff was taught to accept -s to run various commands
with $SUDO. This introduced many instances of $SUDO in merge_file()
where most of them are unnecessary.

In particular, it is not necessary to $SUDO to write the temporary files
as /tmp should be writable by all[0][1].

Also, the usage of sudoedit when comparing the original file with the
merge result is unnecessary. This is because root permissions are not
really required since users should not write to the original file
anyway. The merged file will be used to overwrite the original file at
the end of the function anyway.

Remove these unnecessary usages of $SUDO.

[0]: https://unix.stackexchange.com/a/71625
[1]: https://serverfault.com/a/427290

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Daniel M. Capella <polyzen@archlinux.org>