Refactor player count logic in app.py to enhance clarity

Updated the condition for checking available player slots by replacing the hardcoded value with the variable 'max_players'. This change improves code readability and ensures consistency in player limit handling.

app.py

@@ -1150,7 +1150,7 @@ with tab4:
             col1, col3 = st.columns([2, 3])
 
             with col1:
-                if (10 - len(filled_lineup)) > 0:
+                if (max_players - len(filled_lineup)) > 0:
                     st.markdown(f"""
                             <div style='text-align: left; vertical-align: top; margin-top: 0; padding-top: 0;''>
                                 <b>💰 Per Player:</b> ${round((max_salary - total_salary) / (max_players - len(filled_lineup)), 0)} &nbsp;