channel_msg_8ball.php: use array_rand_value
channel_msg_8ball.php: use array_rand_value

This is a more straightforward way to get a random value from an array.

hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,smrealms/smr,hemberger/smr