MA techniques that relied on the now obsolete `attack_override` deal extra damage

[RedMisao]

Certain MA techniques relied on attack_override to turn the basic attack into a trigger for melee-spells (e.g. Iku's melee -> Ionic whip). However, as it was removed (#73064), the melee attacks are done alongside the spells (e.g. Iku's melee + Ionic whip).

I wasn't able to contact Venera3 to ask them how to use the new attack_vector stuff to replace the previous function, among other things such as attacks requiring the melee weapon but not actually using it for the technique damage.

[RedMisao]

Partially fixed by 0.9.6.19_ex, using Venera3's suggestion of mult_bonuses: 0, although the message is being printed twice due the trick (instead of replacing it as before).