Followup to PORTVAR patch

Marlin/src/module/configuration_store.cpp

 
 #if DISABLED(DISABLE_M503)
 
-  #define CONFIG_ECHO_START do{ if (!forReplay) SERIAL_ECHO_START_P(PORTVAR_SOLO); }while(0)
+  #define CONFIG_ECHO_START do{ if (!forReplay) SERIAL_ECHO_START_P(port); }while(0)
 
   /**
    * M503 - Report current settings in RAM