stage2: fix 50-stage2-fs

features.in/stage2/stage1/modules.d/50-stage2-fs

-kernel/fs/exfat.ko
-kernel/fs/ext2.ko
-kernel/fs/ext3.ko
-kernel/fs/ext4.ko
-kernel/fs/fat.ko
+ext2.ko
+ext3.ko
+ext4.ko
+kernel/fs/exfat
+kernel/fs/fat
 kernel/fs/mbcache.ko
-kernel/fs/ntfs.ko
-kernel/fs/fuse.ko
-kernel/fs/reiserfs.ko
-kernel/fs/vfat.ko
+kernel/fs/ntfs
+kernel/fs/ntfs3
+kernel/fs/fuse/fuse.ko
+kernel/fs/reiserfs