Refactor stack size filtering logic in app.py for improved functionality

- Simplified the condition for filtering based on stack size by removing the 'Specific' check, enhancing the clarity and efficiency of the data filtering process.

app.py

@@ -259,7 +259,7 @@ with tab2:
                         working_df = working_df[working_df['BaseName'].isin(entry_names)]
                     if stack_parse_var == 'Specific' and stack_names:
                         working_df = working_df[working_df['stack'].isin(stack_names)]
-                    if stack_size_var == 'Specific' and low_stack_size_var and high_stack_size_var:
+                    if low_stack_size_var and high_stack_size_var:
                         working_df = working_df[working_df['stack_size'].between(low_stack_size_var, high_stack_size_var)]
                     # if player_parse_var == 'Specific' and player_names:
                     #     working_df = working_df[working_df['BaseName'].isin(player_names)]