Remove image open on macos (ultralytics#1086)

* added option to not open on save

* Update detect.py

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

detect.py

@@ -140,8 +140,6 @@ def detect(save_img=False):
 
     if save_txt or save_img:
         print('Results saved to %s' % Path(out))
-        if platform.system() == 'Darwin' and not opt.update:  # MacOS
-            os.system('open ' + save_path)
 
     print('Done. (%.3fs)' % (time.time() - t0))