net: store moveFlags in UpdateBlock for Classic and TBC parsers

Extends the cold-join fix (block.moveFlags) to the Classic and TBC
parseMovementBlock implementations so that SMSG_UPDATE_OBJECT CREATE
packets on Classic/TBC servers also initialise entity swim/walk state
from the spawn-time movement flags via unitMoveFlagsCallback_.

src/game/packet_parsers_classic.cpp

@@ -103,6 +103,7 @@ bool ClassicPacketParsers::parseMovementBlock(network::Packet& packet, UpdateBlo
         /*float turnRate =*/ packet.readFloat();
 
         block.runSpeed = runSpeed;
+        block.moveFlags = moveFlags;
 
         // Spline data (Classic: SPLINE_ENABLED=0x00400000)
         if (moveFlags & ClassicMoveFlags::SPLINE_ENABLED) {

src/game/packet_parsers_tbc.cpp

@@ -116,6 +116,7 @@ bool TbcPacketParsers::parseMovementBlock(network::Packet& packet, UpdateBlock&
         /*float turnRate =*/ packet.readFloat();
 
         block.runSpeed = runSpeed;
+        block.moveFlags = moveFlags;
 
         // Spline data (TBC/WotLK: SPLINE_ENABLED = 0x08000000)
         if (moveFlags & TbcMoveFlags::SPLINE_ENABLED) {