Fixed the allow-scaling-down-on-0-percent bug. Earlier, if consumed
== 0, it used to log that it won't scale down, but then scale down
anyway (https://github.com/sebdah/dynamic-dynamodb/issues/294). Now, it
won't scale down if consumed == 0 and allow-scaling-down-on-0-percent == false.
Fixed the allow-scaling-down-on-0-percent bug. Earlier, if consumed == 0, it used to log that it won't scale down, but then scale down anyway (https://github.com/sebdah/dynamic-dynamodb/issues/294). Now, it won't scale down if consumed == 0 and allow-scaling-down-on-0-percent == false.