fix: First open/error timeout firing immediately.

First timeout for opening door or indicating error was firing
immediately due to interrupt flag being set after the boot. This also
improves stability of quick subsequent reads, as the interrupt flag is
now cleared before enabling the interrupt.

Core/Src/wiegand.c

@@ -205,6 +205,7 @@ void canpybara_wiegand_zone_response(uint8_t response)
     }
 
     __HAL_TIM_SET_COUNTER(&htim3, 0);
+    __HAL_TIM_CLEAR_FLAG(&htim3, TIM_FLAG_UPDATE);
     HAL_TIM_Base_Start_IT(&htim3);
 }