Fix G28 debug line, M569 calls (#16213)

Marlin/src/gcode/calibrate/G28.cpp

 
   #if HAS_HOMING_CURRENT
     auto debug_current = [](const char * const s, const int16_t a, const int16_t b){
-      DEBUG_ECHO(s); DEBUG_ECHOLNPGM(" current: ", a, " -> ", b);
+      DEBUG_ECHO(s); DEBUG_ECHOLNPAIR(" current: ", a, " -> ", b);
     };
     #if HAS_CURRENT_HOME(X)
       const int16_t tmc_save_current_X = stepperX.getMilliamps();
 
   #if BOTH(STEALTHCHOP_XY, HOME_USING_SPREADCYCLE)
     if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Set XY to spreadCycle...");
-    process_subcommands_now_P(PSTR("M569S0XY"));
+    process_subcommands_now_P(PSTR("M569 S0 X Y"));
   #endif
 
   #if ENABLED(IMPROVE_HOMING_RELIABILITY)
 
   #if BOTH(STEALTHCHOP_XY, HOME_USING_SPREADCYCLE)
     if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("Set XY to StealthChop...");
-    process_subcommands_now_P(PSTR("M569S1XY"));
+    process_subcommands_now_P(PSTR("M569 S1 X Y"));
   #endif
 
   ui.refresh();