movgrab : Use the `rm` Ruby method
movgrab : Use the `rm` Ruby method

Use the `rm` Ruby method instead of `system "rm `
(error reported by `brew audit movgrab`)

Closes #49238.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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