Warn on cold extrusion, dont error

Marlin/src/module/tool_change.cpp

@@ -553,7 +553,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
       #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;