Update inference multiple-counting (#2019)

* Update inference multiple-counting

* update github check

detect.py

@@ -97,7 +97,7 @@ def detect(save_img=False):
                 # Print results
                 for c in det[:, -1].unique():
                     n = (det[:, -1] == c).sum()  # detections per class
-                    s += f'{n} {names[int(c)]}s, '  # add to string
+                    s += f"{n} {names[int(c)]}{'s' * (n > 1)}, "  # add to string
 
                 # Write results
                 for *xyxy, conf, cls in reversed(det):