Refactor player position selection in app.py

- Introduced a form for player position selection, enhancing user interaction by allowing submission of choices.
- Updated the logic to handle specific and all position selections more effectively, improving the overall filtering experience.

app.py

@@ -318,14 +318,18 @@ with tab2:
         with st.container():
             tab1, tab2, tab3, tab4 = st.tabs(['Player Used Info', 'Stack Used Info', 'Stack Size Info', 'General Info'])
             with tab1:
-                col1, col2 = st.columns(2)
-                with col1:
-                    pos_var = st.selectbox("Which position(s) would you like to view?",  ['All', 'Specific'], key='pos_var')
-                with col2:
-                    if pos_var == 'Specific':
+                with st.form(key='player_info_pos_form'):
+                    col1, col2 = st.columns(2)
+                    with col1:
+                        pos_var = st.selectbox("Which position(s) would you like to view?",  ['All', 'Specific'], key='pos_var')
+                    with col2:
                         pos_select = st.multiselect("Select your position(s)", ['P', 'C', '1B', '2B', '3B', 'SS', 'OF'], key='pos_select')
-                    else:
-                        pos_select = None
+                    submitted = st.form_submit_button("Submit")
+                    if submitted:
+                        if pos_var == 'Specific':
+                            pos_select = pos_select
+                        else:
+                            pos_select = None
 
                 if entry_parse_var == 'All':