8166890: JShell: locks forever when input is piped Summary: StopDetectingInputStream.setState must not override the state if the stream is closed. Reviewed-by: rfield, shinyafox

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/