[BUG] Sorting by blocks height

[muknta]

curl http://3.123.154.245:11000/api/blocks?sort=height:desc

I cannot recognize the pattern it uses for sorting

For example, this one is stable:

curl http://3.123.154.245:11000/api/blocks?sort=cr_time:desc

[MrLutik]

@kobs30 I see that height value returns string.