Fix startup parameter issue for samba version 4.15+

Replace parameter "S" from the "-FS" startup script to "--debug-stdout", as the "--log-stdout" parameter was replaced to "--debug-stdout" in smbd version 4.15+

samba.sh

@@ -293,5 +293,5 @@ elif ps -ef | egrep -v grep | grep -q smbd; then
     echo "Service already running, please restart container to apply changes"
 else
     [[ ${NMBD:-""} ]] && ionice -c 3 nmbd -D
-    exec ionice -c 3 smbd -FS --no-process-group </dev/null
+    exec ionice -c 3 smbd -F --debug-stdout --no-process-group </dev/null
 fi