Added the removable option by default. This indicates to smartd that it should continue if the device does not appear to be present when smartd is started.

Closes: #406130
--- a/smartd.conf
+++ b/smartd.conf
@@ -18,7 +18,7 @@
 # Directives listed below, which will be applied to all devices that
 # are found.  Most users should comment out DEVICESCAN and explicitly
 # list the devices that they wish to monitor.
-DEVICESCAN -n standby -m root -M exec /usr/share/smartmontools/smartd-runner
+DEVICESCAN -d removable -n standby -m root -M exec /usr/share/smartmontools/smartd-runner
 
 # Alternative setting to ignore temperature and power-on hours reports
 # in syslog.