Core/Movement: Clean up and improvements on Unit::SetSpeed (#16843)

- Clean up of Unit::SetSpeed (mostly cherry picks from the 6.x branch):
- the opcode sent depends on the unit. until now, MSG_MOVE_SET_* were sent for every units which isn't like retail behavior.
- Removed the unused method parameter "forced" from Unit::SetSpeed
- Renamed Unit::SetSpeed to SetSpeedRate
- Removed the unused method parameter "forced" from Unit::UpdateSpeed
- Added utility method Unit::SetSpeed which take the new flat value.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/server/scripts/World/boss_emerald_dragons.cpp b/src/server/scripts/World/boss_emerald_dragons.cpp
index 1f89720803d..65dec74414b 100644
--- a/src/server/scripts/World/boss_emerald_dragons.cpp
+++ b/src/server/scripts/World/boss_emerald_dragons.cpp
@@ -205,7 +205,7 @@ class npc_dream_fog : public CreatureScript
                     }
                     // Seeping fog movement is slow enough for a player to be able to walk backwards and still outpace it
                     me->SetWalk(true);
-                    me->SetSpeed(MOVE_WALK, 0.75f);
+                    me->SetSpeedRate(MOVE_WALK, 0.75f);
                 }
                 else
                     _roamTimer -= diff;