Clear fb ready flag when stopping script
Clear fb ready flag when stopping script

* This stops the IDE from reading the same frame buffer

tianzhihen/openmv,iabdalkader/openmv,openmv/openmv,tianzhihen/openmv,iabdalkader/openmv,kwagyeman/openmv,tianzhihen/openmv,iabdalkader/openmv,SmartArduino/openmv,openmv/openmv,iabdalkader/openmv,tianzhihen/openmv,kwagyeman/openmv,SmartArduino/openmv,openmv/openmv,kwagyeman/openmv,openmv/openmv,kwagyeman/openmv,SmartArduino/openmv,SmartArduino/openmv