Minor tweak to exit behavior on legacy devices.

Properly refresh the screen when exiting with the framework running.
The lua code to handle that is called while cvm is SIGSTOPP'ed, so it
doesn't help.

platform/kindle/koreader.sh

@@ -235,6 +235,9 @@ fi
 if [ "${STOP_FRAMEWORK}" == "no" -a "${INIT_TYPE}" == "sysv" ] ; then
 	logmsg "Resuming cvm . . ."
 	killall -cont cvm
+	# We need to handle the screen refresh ourselves, frontend/device/kindle/device.lua's Kindle3.exit is called before we resume cvm ;).
+	echo 'send 139' > /proc/keypad
+	echo 'send 139' > /proc/keypad
 fi
 
 # Restart framework (if need be)