Show error dialogs on elevation errors
Show error dialogs on elevation errors

Printing to `stderr` makes no sense since the process is detached from
the shell when packaged.

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