Fixes Arterials Not Applying Bloodloss

[EJDenton]

• The handle_blood proc will now check all organs, not just damaged ones, and apply bloodloss accurately; including arterials where the external wounds are healed.

• Added an arterial check to the proc which determines which external organs are damaged so that the handle_blood proc will correctly remove blood for external organs with arterial bleeds with no damage.

• Arterial severity which applies less than 1u of bloodloss is now accounted for properly and is no longer rounded down to 0.

Fixes: https://github.com/Aurorastation/Aurora.3/issues/17807

[EJDenton]

!bugfix

[EJDenton]

!review

[EJDenton]

I changed the fix altogether in the interest of running checks on fewer organs. If there are any questions let me know.