Fix stack count reference in exposure percentage calculation in app.py

- Updated the variable used to reference the stack count in the exposure percentage calculation, ensuring accurate data representation.
- This change improves the reliability of the metrics displayed and enhances overall data processing accuracy.

app.py

@@ -278,7 +278,7 @@ with tab2:
                 stack_count_var = 0
                 for each_set in [stack_counts, stack_1per_counts, stack_5per_counts, stack_10per_counts, stack_20per_counts]:
                     set_frame = each_set.to_frame().reset_index().rename(columns={'index': 'Stack', 'count': 'Count'})
-                    st.write(each_len_set[player_count_var])
+                    st.write(each_len_set[stack_count_var])
                     set_frame['Percent'] = set_frame['Count'] / each_len_set[stack_count_var]
                     set_frame = set_frame[['Stack', 'Percent']]
                     set_frame = set_frame.rename(columns={'Percent': f'Exposure {each_set_name[stack_count_var]}'})