fixed exposure_player default var

app.py

@@ -1150,7 +1150,7 @@ with tab2:
                         st.session_state['export_merge'] = st.session_state['working_frame'].copy()
             with st.expander('Exposure Management'):
                 with st.form(key='Exposures'):
-                    exposure_player = st.selectbox("Player", options=sorted(list(player_names)), default=[])
+                    exposure_player = st.selectbox("Player", options=sorted(list(player_names)))
                     exposure_target = st.number_input("Target Exposure", value=.25, min_value=0.0, max_value=1.0, step=0.01)
                     exposure_stack_bool = st.selectbox("Maintain Stacks?", options=['Yes', 'No'], index=0)
                     submitted = st.form_submit_button("Submit")