minor bug fix

app.py

@@ -12,9 +12,9 @@ st.title('Semantic Segmentation using SegFormer')
 #raw_image = st.file_uploader('Raw Input Image')
 raw_image = st.selectbox(
      'Choose any one image for inference',
-     ('image1.jpg', 'image2.jpg', 'image3.jpg'))
+     ('Select image', 'image1.jpg', 'image2.jpg', 'image3.jpg'))
 
-if raw_image is not None:
+if raw_image != 'Select image':
 	df = pd.read_csv('class_dict_seg.csv')
 	classes = df['name']
 	palette = df[[' r', ' g', ' b']].values