fix name of DUD-E database

app.py

@@ -126,6 +126,8 @@ def retrieval():
         selected_database = st.selectbox(
                 'Select database',('Lenselink', 'Davis', 'DUD-E')
             )
+        if selected_database == 'DUD-E':
+            selected_database = 'DUDE'
         c1, c2 = st.columns(2)
         with c2:
             st.image('figures/multi_molecules.png', use_column_width='always') #, width=125)