Stop scanner interval before starting a new one
Stop scanner interval before starting a new one

This ensures there are no orphaned intervals running.

resin-io/etcher,resin-io/etcher,cedricve/etcher,resin-io/herostratus,cedricve/etcher,resin-io/etcher,resin-io/etcher,resin-io/herostratus,cedricve/etcher,resin-io/etcher,resin-io/resin-etcher,resin-io/resin-etcher