Wrong key deleted when bucket is empty

[RisbergAdam]

The drain bucket routine is using the LeakyBucketSpecialKeys object instead a member of that object when constructing the key to be deleted when the count in a bucket reaches below zero:

graphile-worker-rate-limiter/src/LeakyBucket.ts

Line 79 in a5c2a9f

.del(`${bucketTypeName}:${bucketName}:${LeakyBucketSpecialKeys}`)

This causes the bucket count to continuously decreasing way past 0.