samsung-herolte: fix indent in nonfree_firmware (!478)

As spaces instead of tabs were used, pmbootstrap would error out when
using `samsung-herolte` during init.
6 jobs for master in 2 minutes and 24 seconds
Status Job ID Name Coverage
  First
passed #246539758
aports-static

00:00:27

passed #246539757
clang-format-static

00:00:25

passed #246539756
py-sh-static

00:00:43

passed #246539755
wiki

00:00:25

 
  Second
passed #246539760
aports-build

00:01:40

passed #246539759
aports-static-upstream

00:00:46