fix: procd script cannot auto re-auth

In previous version, start_pre() is executed ONLY ONCE when the script is loaded by procd, while ONLY the "online" command is set as procd's instance command.
This causes procd will only try to respawn the "online" command, rather than "deauth-auth-login" again.

docs/init.d/goauthing

@@ -7,17 +7,20 @@ START=98
 PROG="/usr/bin/goauthing"  # cp script to this path first
 CONF="/etc/goauthing.json"
 
-start_pre() {
-	"$PROG" -c "$CONF" -D deauth
-	"$PROG" -c "$CONF" -D auth
-	"$PROG" -c "$CONF" -D login
+generate_command() {
+CMD="\
+\"$PROG\" -c \"$CONF\" -D deauth; \
+\"$PROG\" -c \"$CONF\" -D auth; \
+\"$PROG\" -c \"$CONF\" -D login; \
+\"$PROG\" -c \"$CONF\" -D online; \
+"
 }
 
 start_service() {
-	start_pre
+	generate_command
 	procd_open_instance
-	procd_set_param command "$PROG"
-	procd_append_param command -c "$CONF" -D online
+	procd_set_param command sh
+	procd_append_param command -c "$CMD"
 	procd_set_param stderr 1
 	procd_set_param respawn
 	procd_close_instance

docs/init.d/goauthing@

@@ -7,19 +7,26 @@ START=98
 PROG="/usr/bin/goauthing"
 SERV=goauthing  # UCI config at /etc/config/goauthing
 
+generate_command() {
+CMD="\
+\"$PROG\" $1 deauth; \
+\"$PROG\" $1 auth; \
+\"$PROG\" $1 login; \
+\"$PROG\" $1 online; \
+"
+}
+
 start_instance() {
   local username password
   config_get username config username
   config_get password config password
   local args="-u $username -p $password"
 
-  "$PROG" $args deauth
-  "$PROG" $args auth
-  "$PROG" $args login
+  generate_command "$args"
 
   procd_open_instance
-  procd_set_param command "$PROG"
-  procd_append_param command $args online
+  procd_set_param command sh
+  procd_append_param command -c "$CMD"
   procd_set_param stderr 1
   procd_set_param respawn
   procd_close_instance