Clear session state on manual contest file upload in app.py

- Added logic to clear the session state when a manual contest file is uploaded, ensuring a fresh start for user interactions.
- Removed the display of the date selection to streamline the interface, enhancing user experience and focus on essential inputs.

app.py

@@ -66,7 +66,6 @@ with tab1:
         date_select = date_select.replace('-', '')
     with col4:
         type_var = st.selectbox("Select Game Type", ['Classic', 'Showdown'], key='type_var')
-    st.write(date_select)
     col1, col2 = st.columns(2)
 
     with col1:
@@ -80,6 +79,7 @@ with tab1:
             else:
                 pass
         elif parse_type == 'Manual':
+            st.session_state.clear()
             st.session_state['Contest_file'] = st.file_uploader("Upload Contest File (CSV or Excel)", type=['csv', 'xlsx', 'xls'])
             if 'Contest' in st.session_state:
                 del st.session_state['Contest']
@@ -234,7 +234,7 @@ with tab2:
                         format(formatter='{:.2%}', subset=st.session_state['player_frame'].iloc[:, 2:].select_dtypes(include=['number']).columns),
                         hide_index=True)
                 else:
-                    
+
                     st.session_state['player_frame'] = create_player_exposures(working_df, player_columns, entry_names)
                     hold_frame = st.session_state['player_frame'].copy()
                     hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])