Fix ls -h total size bug

[benny8453123]

Hi,

I found a bug and tried to fix it: While using ls -h, the total size of the folder shows the wrong value.

Environment

$ ls -l
total 2097156
-rw-rw-r-- 1 benchang benchang 2147483648  七  17 18:09 2G_file

Before:

$ ../toybox/toybox ls -h
total 2.0M
2G_file

$ ../toybox/toybox ls -sh --block-size=4096
total 512K
512K 2G_file

After:

$ ../toybox/toybox ls -h
total 2.0G
2G_filels 

$ ../toybox/toybox ls -sh --block-size=4096
total 2.0G
2.0G 2G_file

I have done several tests, and it looks correct and like there are no other side effects.
E.g.:

ls -h
ls -l
ls -s
ls -ls
ls -lh
ls -hs
ls -lhs
ls -h --block-size=1024
ls -l --block-size=1024
ls -s --block-size=1024
ls -ls --block-size=1024
ls -lh --block-size=1024
ls -hs --block-size=1024
ls -lhs --block-size=1024
ls -h --block-size=4096
ls -l --block-size=4096
ls -s --block-size=4096
ls -ls --block-size=4096
ls -lh --block-size=4096
ls -hs --block-size=4096
ls -lhs --block-size=4096