Better manage cooler messages

MK/Configuration_Store.cpp

@@ -853,7 +853,7 @@ void Config_ResetDefault() {
         ECHO_EMV(" D", unscalePID_d(bedKd));
       #endif
       #if ENABLED(PIDTEMPCOOLER)
-        ECHO_SMV(CFG, "  M304 L P", coolerKp); // for compatibility with hosts, only echos values for E0
+        ECHO_SMV(CFG, "  M304 C P", coolerKp); // for compatibility with hosts, only echos values for E0
         ECHO_MV(" I", unscalePID_i(coolerKi));
         ECHO_EMV(" D", unscalePID_d(coolerKd));
       #endif

MK/module/MK_Main.cpp

@@ -2943,6 +2943,7 @@ inline void do_blocking_move_to_z(float z) { do_blocking_move_to(current_positio
 
 #if HAS(TEMP_COOLER)
   void print_coolerstates() {
+    ECHO_M(" COOL: ");
     ECHO_MV(SERIAL_C, degCooler(), 1);
     ECHO_MV(" /", degTargetCooler(), 1);
     ECHO_M(SERIAL_CAT);