tab hack: jumps back to first tab

[chrigesch]

check: (1) streamlit/streamlit#4996 (comment) or (2) https://discuss.streamlit.io/t/i-wanted-to-ask-if-there-is-a-functionality-that-while-working-with-tabs-lets-you-block-some-of-them-till-a-condition-happens/35234/5