tox: Remove '--skip B322' from Bandit config.

• B322 was the check that blacklists input(). We were skipping it because input() is fine to use in Python 3.
• Now that Bandit 1.7.0 is Python 3 only, they removed the check, and '--skip B322' errors out (instead of quietly doing nothing) which caused tox to fail every patch. This removes the flag so that Jenkins passes again.

Bug: T270969
Change-Id: I5c1db73928399e8101ebd6b1338ec97913dba088