[z2112] Improve Initialisation of COMMAND_ATTACK field

This moves the set command of COMMAND_ATTACK out of CharmInfo::InitPetAction bar, so that this function can be used more genericly for other purposes

Signed-off-by: Schmoozerd <cmangos>

(based on commit [12163] - 9b0d888)

(based on commit [s1735] - a18d019)