fix autosuggestion bug

[elseawhy]

This pr fixes #986

Previously splitting a word by inserting a space would cause overlaps_with to return true since the split suffix technically overlapped the original byte range, which incorrectly triggers a restart. In Restart, auto-started is hardcoded to true, this causes the auto suggestion menu to flash briefly if a restart is triggered when auto suggestion is disabled. The better and more correct way would be comparing the old and new state directly via new_wuc.start == current_wuc.start

To address the hardcoded auto-suggest = true during restart, i added this

                    let was_auto_started = previous_suggestions
                        .as_ref()
                        .map(|previous_active| previous_active.auto_started)
                        .unwrap_or(true);

to extract the previous state ( whether it was auto started or not ), instead of hardcoding it to be true :)