Split Supersaturation validation

Q: If the ss changes from scan_up to scan_down, what it the true_super_sat? The value during scan_up?

• If change is in scan_up, invalidate
• If change is in scan_down, no action
• If the user validates a scan where the ss changes, the displayed ss should become the true_super_sat instead of ', '.join(map(str, np.unique(curr_scan.processed_super_sats)))