Core/Units: Update PlayHoverAnim state when flying or hovering

Port From (https://github.com/TrinityCore/TrinityCore/commit/c1b36eec5678090654dfd65a3fef29ea8ada6ef2)

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -734,6 +734,16 @@ namespace Game.Entities
                     SetAnimTier(AnimTier.Ground);
             }
 
+            if (IsAlive())
+            {
+                if (IsGravityDisabled() || IsHovering())
+                    SetPlayHoverAnim(true);
+                else
+                    SetPlayHoverAnim(false);
+            }
+            else if (IsPlayer()) // To update player who dies while flying/hovering
+                SetPlayHoverAnim(false, false);
+
             return true;
         }
 
@@ -1112,6 +1122,16 @@ namespace Game.Entities
                     SetAnimTier(AnimTier.Ground);
             }
 
+            if (IsAlive())
+            {
+                if (IsGravityDisabled() || IsHovering())
+                    SetPlayHoverAnim(true);
+                else
+                    SetPlayHoverAnim(false);
+            }
+            else if (IsPlayer()) // To update player who dies while flying/hovering
+                SetPlayHoverAnim(false, false);
+
             return true;
         }
 
@@ -1661,10 +1681,16 @@ namespace Game.Entities
 
         public bool IsPlayingHoverAnim() { return _playHoverAnim; }
         
-        void SetPlayHoverAnim(bool enable)
+        void SetPlayHoverAnim(bool enable, bool sendUpdate = true)
         {
+            if (IsPlayingHoverAnim() == enable)
+                return;
+
             _playHoverAnim = enable;
 
+            if (!sendUpdate)
+                return;
+
             SetPlayHoverAnim data = new();
             data.UnitGUID = GetGUID();
             data.PlayHoverAnim = enable;