fix example proteins bug

ProtHGT_app.py

@@ -38,8 +38,6 @@ if 'submitted' not in st.session_state:
     st.session_state.submitted = False
 if 'previous_inputs' not in st.session_state:
     st.session_state.previous_inputs = None
-if 'example_proteins' not in st.session_state:
-    st.session_state.example_proteins = random.sample(available_proteins, 5)
 
 with st.expander("🚀 Upcoming Features"):
     st.info("""
@@ -82,7 +80,10 @@ with st.sidebar:
         </div>
     """, unsafe_allow_html=True)
 
-    available_proteins = get_available_proteins() 
+    available_proteins = get_available_proteins()
+    
+    if 'example_proteins' not in st.session_state:
+        st.session_state.example_proteins = random.sample(available_proteins, 5)
 
     selected_proteins = []