Core/PacketIO: Added structures and enabled spline movement status opcodes: swim, fly, feather fall, water walk

Closes #10068

src/server/game/Entities/Unit/Unit.cpp

@@ -16690,7 +16690,7 @@ bool Unit::SetWalk(bool enable)
     if (enable)
         Movement::PacketSender(this, SMSG_SPLINE_MOVE_SET_WALK_MODE, SMSG_SPLINE_MOVE_SET_WALK_MODE).Send();
     else
-        Movement::PacketSender(this, SMSG_SPLINE_MOVE_SET_RUN_MODE, SMSG_SPLINE_MOVE_SET_WALK_MODE).Send();
+        Movement::PacketSender(this, SMSG_SPLINE_MOVE_SET_RUN_MODE, SMSG_SPLINE_MOVE_SET_RUN_MODE).Send();
 
     return true;
 }