Update contest file upload handling in app.py for improved session state management

- Renamed the session state key for the uploaded contest file to enhance clarity and prevent confusion.
- Added logic to copy the uploaded contest file to the session state, ensuring data persistence for further processing.
- Maintained existing functionality for contest file loading while improving the overall user experience during manual uploads.

app.py

@@ -80,12 +80,14 @@ with tab1:
                 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'])
+            st.session_state['Contest_upload'] = st.file_uploader("Upload Contest File (CSV or Excel)", type=['csv', 'xlsx', 'xls'])
+            if st.session_state['Contest_upload'] is not None:
+                st.session_state['Contest_file'] = st.session_state['Contest_upload'].copy()
             st.session_state['Contest_file_helper'] = grab_contest_data(sport_select, name_parse.iloc[0], contest_id_map, date_select)
             if 'Contest' in st.session_state:
                 del st.session_state['Contest']
 
-        if 'Contest_file' in st.session_state and 'Adj_Contest' not in st.session_state:
+        if 'Contest_file' in st.session_state:
             if 'Contest_file_helper' in st.session_state:
                 st.session_state['Contest'], st.session_state['ownership_df'], st.session_state['actual_df'], st.session_state['salary_df'], st.session_state['team_df'], st.session_state['pos_df'], st.session_state['entry_list'], check_lineups = load_contest_file(st.session_state['Contest_file'], st.session_state['Contest_file_helper'], sport_select)
             else: