It's up to you. If you start having problems with cravings, or overeatingon legal foods to avoid eating non LC foods, then yes go back to induction to clean out your system and get back on track. Otherwise just pick up where you left off.

Take it as a live and learn type thing. Look back and think which treats were worth it. Could you have survived and been happy with just 1 bite or 2 of the M&M brownie? Also a small cheat doesn't mean throw away the rest of the day or that nice gassy bloating feeling is worse. Next time just decide what's worth it and what's not, then force yourself to stick to that. You'll feel alot more in control.