daemon/graphdriver/fuse-overlayfs: Init(): fix directory permissions (staticcheck)

    daemon/graphdriver/fuse-overlayfs/fuseoverlayfs.go:101:63: SA9002: file mode '700' evaluates to 01274; did you mean '0700'? (staticcheck)
        if err := idtools.MkdirAllAndChown(path.Join(home, linkDir), 700, currentID); err != nil {
                                                                     ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/graphdriver/fuse-overlayfs/fuseoverlayfs.go

@@ -98,7 +98,7 @@ func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
 	if err := idtools.MkdirAllAndChown(home, 0710, dirID); err != nil {
 		return nil, err
 	}
-	if err := idtools.MkdirAllAndChown(path.Join(home, linkDir), 700, currentID); err != nil {
+	if err := idtools.MkdirAllAndChown(path.Join(home, linkDir), 0700, currentID); err != nil {
 		return nil, err
 	}