Pass --device for --task study (ultralytics#5118)

val.py

@@ -346,7 +346,7 @@ def main(opt):
             for i in x:  # img-size
                 print(f'\nRunning {f} point {i}...')
                 r, _, t = run(opt.data, weights=w, batch_size=opt.batch_size, imgsz=i, conf_thres=opt.conf_thres,
-                              iou_thres=opt.iou_thres, save_json=opt.save_json, plots=False)
+                              iou_thres=opt.iou_thres, device=opt.device, save_json=opt.save_json, plots=False)
                 y.append(r + t)  # results and times
             np.savetxt(f, y, fmt='%10.4g')  # save
         os.system('zip -r study.zip study_*.txt')