Enhance contest information reset functionality in app.py

- Introduced a new session state variable 'contest_info_reset' to store the original contest data, allowing for a more effective reset of the displayed contest information.
- Updated the reset logic to utilize this new variable, improving the accuracy of the reset functionality and enhancing user experience.

app.py

@@ -260,6 +260,7 @@ with tab2:
         st.session_state['field_player_frame'] = create_player_exposures(working_df, st.session_state['player_columns'])
         st.session_state['field_stack_frame'] = create_stack_exposures(working_df)
         st.session_state['display_contest_info'] = working_df.copy()
+        st.session_state['contest_info_reset'] = working_df.copy()
         st.session_state['unique_players'] = pd.unique(st.session_state['display_contest_info'][st.session_state['player_columns']].values.ravel('K'))
         st.session_state['unique_players'] = [p for p in st.session_state['unique_players'] if p != 'nan']  # Remove any NaN values
 
@@ -284,7 +285,7 @@ with tab2:
                     st.session_state['player_names'] = []
                     st.session_state['remove_var'] = 'No'
                     st.session_state['remove_names'] = []
-                    st.session_state['display_contest_info'] = working_df.copy()
+                    st.session_state['display_contest_info'] = st.session_state['contest_info_reset'].copy()
                     st.session_state['unique_players'] = pd.unique(st.session_state['display_contest_info'][st.session_state['player_columns']].values.ravel('K'))
                     st.session_state['unique_players'] = [p for p in st.session_state['unique_players'] if p != 'nan']  # Remove any NaN values