Refactor date list generation in app.py for improved efficiency

- Simplified the logic for generating the date list by combining the extraction of unique dates and sorting into a single line, enhancing code readability and performance.
- Ensured that the date selection dropdown continues to function correctly, maintaining the user experience for contest selection.

app.py

@@ -58,8 +58,7 @@ with tab1:
         contest_names, contest_id_map, curr_info = grab_contest_names(db, sport_select)
         
     with col3:
-        date_list_raw = curr_info['Date'].unique()
-        date_list = date_list_raw.sort_values(ascending=False)
+        date_list = curr_info['Date'].sort_values(ascending=False).unique()
         date_select = st.selectbox("Select Date", date_list, key='date_select')
         
         name_parse = curr_info[curr_info['Date'] == date_select]['Contest Name'].reset_index(drop=True)