Update player position handling in app.py for GOLF sport case

- Modified the logic for setting player positions to handle the 'GOLF' sport case by assigning a fixed position of 'G'.
- Retained existing functionality for other sports by mapping player positions from the provided dictionary.
- Improved clarity in the code while maintaining the overall functionality of player frame processing.

app.py

@@ -240,7 +240,10 @@ with tab2:
 
                     st.session_state['player_frame'] = create_player_exposures(working_df, player_columns)
                     hold_frame = st.session_state['player_frame'].copy()
-                    hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
+                    if sport_select == 'GOLF':
+                        hold_frame['Pos'] = 'G'
+                    else:
+                        hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
                     st.session_state['player_frame'].insert(1, 'Pos', hold_frame['Pos'])
                     st.session_state['player_frame'] = st.session_state['player_frame'].dropna(subset=['Pos'])
                     if pos_select: