Fixed top-coordinate output when -ext_output is used for video

AlexeyAB

2018-05-28 1b7a1a0f33538c9544ad4bf693b4a4247a5548b8

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25