Typo on the test section

[graemerae]

CURRENT:
fuse-ext2 /tmp/fuse-ext2.test-fs.ext4 -o rw+,allow_other,uid=501,gid=20

CORRECT:
fuse-ext2 /tmp/test-fs.ext4 ~/mnt/fuse-ext2.test-fs.ext4 -o rw+,allow_other,uid=501,gid=20