loader.efi.8: Remove rogue duplicated lines

Fixes: 871911a4ab73 ("loader.efi(8): beef up the updating the ESP")
MFC after: 1 week

(cherry picked from commit 18f7683e0d6ee6858865d8b0c2d7e2c14abf0bc4)
(cherry picked from commit 8aa8d0aa64babc579a55a7ed27ea6385895901d3)

Approved-by: re (cperciva)