Birbs Have Wings Too (#477)

# Description

During PR #464, somehow Moth's got back their ability to move with their
wings whenever the gravity gets shut off. Well, I'm here to correct the
injustice by also putting it on Harpies. In fact, Harpies have a much
bigger claim to it, their wings are absolutely massive compared to
Moths.

# Changelog

:cl:
- add: Harpies remembered that just like moths; they also have wings,
and can zoom whenever the gravity turns off.

Co-authored-by: Danger Revolution! <[email protected]>

Resources/Prototypes/DeltaV/Entities/Mobs/Species/harpy.yml

@@ -121,6 +121,7 @@
   - type: MovementSpeedModifier
     baseWalkSpeed: 2.5
     baseSprintSpeed: 5.0
+    weightlessAcceleration: 2.5
   - type: Inventory
     speciesId: harpy
     templateId: digitigrade