fix tests

Author: codehz

tests/test_thread.nim

@@ -39,7 +39,7 @@ proc worker_fn() {.thread.} =
   for _ in 0..<COUNT:
     let val = r.rand(1048576)
     # increase the chance of collision
-    if val > 1024:
+    if val < 1024:
       sleep(1)
     when useMemFs:
       tdb.insert_data(val)