Refactor percentile finish calculation in app.py

- Updated the calculation of the 'percentile_finish' column to use the index after resetting it, improving the accuracy of percentile rankings.
- Removed the 'sorted' column along with the index to streamline the dataframe, enhancing overall data processing efficiency.

app.py

@@ -147,8 +147,9 @@ with tab2:
                 axis=1
             )
             working_df['dupes'] = working_df.groupby('sorted').transform('size')
-            working_df['percentile_finish'] = working_df['actual_fpts'].rank(pct=True)
-            working_df = working_df.drop('sorted', axis=1)
+            working_df = working_df.reset_index()
+            working_df['percentile_finish'] = working_df['index'].rank(pct=True)
+            working_df = working_df.drop(['sorted', 'index'], axis=1)
         elif type_var == 'Showdown':
             working_df['stack'] = working_df.apply(
                 lambda row: Counter(
@@ -184,8 +185,9 @@ with tab2:
                 axis=1
             )
             working_df['dupes'] = working_df.groupby('sorted').transform('size')
-            working_df['percentile_finish'] = working_df['actual_fpts'].rank(pct=True)
-            working_df = working_df.drop('sorted', axis=1)
+            working_df = working_df.reset_index()
+            working_df['percentile_finish'] = working_df['index'].rank(pct=True)
+            working_df = working_df.drop(['sorted', 'index'], axis=1)
         
         # Initialize pagination in session state if not exists
         if 'current_page' not in st.session_state: