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

- Modified the condition for loading contest data to ensure it only occurs when 'Contest_file' is present in session state, enhancing clarity and preventing unnecessary data loading.
- This change aligns with previous refactoring efforts to streamline session state checks and improve user experience.

app.py

@@ -77,7 +77,7 @@ with tab1:
             if 'Contest' in st.session_state:
                 del st.session_state['Contest']
 
-        if 'Contest_file' not in st.session_state and 'Adj_Contest' not in st.session_state:
+        if 'Contest_file' in st.session_state and 'Adj_Contest' not in st.session_state:
             st.session_state['Contest'], st.session_state['ownership_df'], st.session_state['actual_df'], st.session_state['entry_list'] = load_contest_file(st.session_state['Contest_file'], sport_select)
             st.session_state['Contest'] = st.session_state['Contest'].dropna(how='all')
             st.session_state['Contest'] = st.session_state['Contest'].reset_index(drop=True)