bug fix for default prompt

pages/Gallery.py

@@ -309,7 +309,7 @@ class GalleryApp:
             prompts = np.sort(items['prompt'].unique())[::1].tolist()
 
             # selt focus prompt index if exists
-            if st.session_state.gallery_focus['prompt'] is None:
+            if st.session_state.gallery_focus['prompt'] is None or tag != st.session_state.gallery_focus['tag']:
                 prompt_focus_idx = 0
             else:
                 prompt_focus_idx = 1 + prompts.index(st.session_state.gallery_focus['prompt'])