Make the MD_BOSS have the flag that boss_monster have

[Vaans]

Is your feature request related to a problem? Please describe.

Currently the IA MD_BOSS is a special flag which makes mobs immune to certain status changes and skills. The problem is, that isn't activated the flag that have boss_monster, I think is this flag "BTYPE_MVP". So, the only way that a client can retrieve boss information, like HP BAR or the MVP ICON is via boss_monster, limited to only use via script, and limited to use with monster script or bloody branches.

Describe the solution you'd like
When a monster have the IA MD_BOSS make the flag that have boss_monster to make the client read this type of flags.

Describe alternatives you've considered
N/A

Additional context
N/A