Warn on cold extrusion, dont error

Marlin/src/feature/pause.cpp

 
   #if ENABLED(PREVENT_COLD_EXTRUSION)
     if (!DEBUGGING(DRYRUN) && thermalManager.targetTooColdToExtrude(active_extruder)) {
-      SERIAL_ERROR_MSG(MSG_ERR_HOTEND_TOO_COLD);
+      SERIAL_ECHO_MSG(MSG_ERR_HOTEND_TOO_COLD);
       return false;
     }
   #endif
   #endif
 
   if (!DEBUGGING(DRYRUN) && unload_length && thermalManager.targetTooColdToExtrude(active_extruder)) {
-    SERIAL_ERROR_MSG(MSG_ERR_HOTEND_TOO_COLD);
+    SERIAL_ECHO_MSG(MSG_ERR_HOTEND_TOO_COLD);
 
     #if HAS_LCD_MENU
       if (show_lcd) { // Show status screen

Marlin/src/module/tool_change.cpp

       #endif
       if (should_swap) {
         if (too_cold) {
-          SERIAL_ERROR_MSG(MSG_ERR_HOTEND_TOO_COLD);
+          SERIAL_ECHO_MSG(MSG_ERR_HOTEND_TOO_COLD);
           #if ENABLED(SINGLENOZZLE)
             active_extruder = tmp_extruder;
             return;