tests/extmod: Change expected errno code from 36 to 30 in VfsLfs2 test.

Errno 30 is EROFS, which is now the correct value reported by littlefs 2.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/vfs_lfs_mount.py.exp

@@ -13,4 +13,4 @@ package
 hello from lfs
 lfsmod2.py: print("hello from lfs")
 
-OSError(36,)
+OSError(30,)