message: test: fix timeout decrease in feature_assumevalid
diff: @@ -90,7 +90,7 @@ class AssumeValidTest(BitcoinTestFramework):
  last_height = current_height
  if timeout < 0:
  assert False, "blockchain too short after timeout: %d" % current_height
  - timeout - 0.25
  + timeout -= 0.25
  continue
  elif current_height > height:
  assert False, "blockchain too long: %d" % current_height
  