Updates to the way that timers are forced to overflow in oneshot mode.

Now the current count value is saved, and then passed to the listeners.  This _should_ mean that CC3D PPM might work this time.

src/main/drivers/pwm_output.c

@@ -154,8 +154,7 @@ void pwmFinishedWritingMotors(uint8_t numberMotors)
 			if(motors[index]->tim != lastTimerPtr){
 				lastTimerPtr = motors[index]->tim;
 
-				// Force an overflow by setting the UG bit
-				motors[index]->tim->EGR |= 0x0001;
+				timerForceOverflow(motors[index]->tim);
 			}
 		}