Delete environment into black hole register
Delete environment into black hole register

If `dse` removes lines, it deletes them into the black hole register (`_`), thus not wasting the registers " and 1, nor losing the register 9

lervag/vimtex,lervag/vimtex,kmarius/vimtex,Aster89/vimtex,kmarius/vimtex,Aster89/vimtex