Fix image segmentation example - don't reopen image (#30481)

Fix image segmentation example - don't repoen image

docs/source/en/tasks/semantic_segmentation.md

@@ -115,7 +115,7 @@ In instance segmentation, the goal is not to classify every pixel, but to predic
 
 ```python
 instance_segmentation = pipeline("image-segmentation", "facebook/mask2former-swin-large-cityscapes-instance")
-results = instance_segmentation(Image.open(image))
+results = instance_segmentation(image)
 results
 ```
 
@@ -148,7 +148,7 @@ Panoptic segmentation combines semantic segmentation and instance segmentation,
 
 ```python
 panoptic_segmentation = pipeline("image-segmentation", "facebook/mask2former-swin-large-cityscapes-panoptic")
-results = panoptic_segmentation(Image.open(image))
+results = panoptic_segmentation(image)
 results
 ```
 As you can see below, we have more classes. We will later illustrate to see that every pixel is classified into one of the classes.