now removing also the signature when starting over the form

ui_manager.py

@@ -62,4 +62,6 @@ def build_ui_for_form_created():
         del st.session_state["step"]
         del st.session_state["pdf_form"]
         del st.session_state["pdf_form_filename"]
+        if "signature" in st.session_state:
+            del st.session_state["signature"]
         st.rerun()