Allow cold change of active extruder (#12055)

Followup to #11994

Marlin/src/module/tool_change.cpp

@@ -650,6 +650,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
             if (!DEBUGGING(DRYRUN) && thermalManager.targetTooColdToExtrude(active_extruder)) {
               SERIAL_ERROR_START();
               SERIAL_ERRORLNPGM(MSG_HOTEND_TOO_COLD);
+              active_extruder = tmp_extruder;
               return;
             }
           #endif