f2fs: assign default compression level

[ Upstream commit 00e120b5

 ]

Let's avoid any confusion from assigning compress_level=0 for LZ4HC and ZSTD.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: f5f3bd90

 ("f2fs: set the default compress_level on ioctl")
Signed-off-by: Sasha Levin <sashal@kernel.org>