btrfs: selftests: correct RAID stripe-tree feature flag setting

RAID stripe-tree is an incompatible feature not a read-only compatible, so
set the incompat flag not a compat_ro one in the selftest code.

Subsequent changes in btrfs_delete_raid_extent() will start checking for
this flag.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: morbidrsa

fs/btrfs/tests/raid-stripe-tree-tests.c

@@ -478,8 +478,8 @@ static int run_test(test_func_t test, u32 sectorsize, u32 nodesize)
 		ret = PTR_ERR(root);
 		goto out;
 	}
-	btrfs_set_super_compat_ro_flags(root->fs_info->super_copy,
-					BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE);
+	btrfs_set_super_incompat_flags(root->fs_info->super_copy,
+				       BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE);
 	root->root_key.objectid = BTRFS_RAID_STRIPE_TREE_OBJECTID;
 	root->root_key.type = BTRFS_ROOT_ITEM_KEY;
 	root->root_key.offset = 0;