Blocks list query - sort by height compares a string, not a number (9999 near the 99989)

[muknta]

Introduced by #51

curl http://3.123.154.245:11000/api/blocks?limit=1&offset=11&sort=desc

returns "... "height": "99989", "

curl http://3.123.154.245:11000/api/blocks?limit=1&offset=10&sort=desc

returns "... "height":"9999", "

curl http://3.123.154.245:11000/api/blocks?limit=1&offset=9&sort=desc

returns "... "height":"99990", "

[MrLutik]

@muknta
When you use sort=desc (without specifying a field), it sorts by "cr_time" (creation time), NOT by "height"!
It's default behavior.

curl "http://3.123.154.245:11000/api/blocks?limit=1&offset=10&sort=height:desc"