Enhance session state initialization for adjusted dataframes in app.py

- Added a check to ensure 'Adj_Contest' is initialized in session state before calling the find_name_mismatches function, preventing unnecessary overwrites.
- Improved data handling by maintaining existing adjusted dataframes, ensuring data integrity during file uploads.

app.py

@@ -74,7 +74,8 @@ with tab1:
         
     if Contest_file and projections_file:
         st.subheader("Name Matching functions")
-        st.session_state['Adj_Contest'], st.session_state['Adj_projections_df'], st.session_state['Adj_ownership_df'], st.session_state['Adj_actual_df'] = find_name_mismatches(st.session_state['Contest'], st.session_state['projections_df'], st.session_state['ownership_df'], st.session_state['actual_df'])
+        if 'Adj_Contest' not in st.session_state:
+            st.session_state['Adj_Contest'], st.session_state['Adj_projections_df'], st.session_state['Adj_ownership_df'], st.session_state['Adj_actual_df'] = find_name_mismatches(st.session_state['Contest'], st.session_state['projections_df'], st.session_state['ownership_df'], st.session_state['actual_df'])
         st.session_state['Adj_projections_df']['salary'] = (st.session_state['Adj_projections_df']['salary'].astype(str).str.replace(',', '').astype(float).astype(int))
         st.session_state['ownership_dict'] = dict(zip(st.session_state['Adj_ownership_df']['Player'], st.session_state['Adj_ownership_df']['Own']))
         st.session_state['actual_dict'] = dict(zip(st.session_state['Adj_actual_df']['Player'], st.session_state['Adj_actual_df']['FPTS']))