Update session state handling in app.py to improve contest data management

- Changed the condition for deleting the contest entry from session state to check 'display_contest_info' instead of 'Contest', ensuring accurate handling of contest data.
- This update enhances data integrity by preventing potential errors related to empty contest information and streamlining session state management.

app.py

@@ -193,8 +193,8 @@ with tab1:
             
             st.session_state['portfolio_df'] = st.session_state['portfolio_df'][['BaseName', 'EntryCount'] + original_columns]
 
-            if 'Contest' in st.session_state and st.session_state['Contest'][st.session_state['Contest']['BaseName'] == 'Backtesting_upload'].empty:
-                del st.session_state['Contest']
+            if 'display_contest_info' in st.session_state and st.session_state['display_contest_info'][st.session_state['display_contest_info']['BaseName'] == 'Backtesting_upload'].empty:
+                del st.session_state['display_contest_info']
             else:
                 pass
         except: