Quick fix for CMSG_FORCE_MOVE_ROOT_ACK and CMSG_FORCE_MOVE_UNROOT_ACK (#1937)

**Original issue:**
https://github.com/mod-playerbots/mod-playerbots/issues/1902
**Original cause:** charmed bot (with lost client control) got rooted at
the same time.

**How to reproduce:**
1. Spawn creatures 11350 (x3) and 11830 (x3) using the command: `.npc
add <entry>` in a quiet place.
2. Create any party with random bots or alt bots (should be 60-65
levels), make sure there is at least one healer.
3. Set the healer's mana to a high value, like 100M, using command:
`.mod mana <value>`.
4. Start the fight while continuously respawning creatures with: `.resp
all`.
5. When console starts to spam 'heartbeat' messages, check your party
members' movement flags to identify which one has `MOVEMENTFLAG_ROOT`
0x00000800 (2048) using the command: `.debug move`.

This PR will not fix ALL 'heartbeat' issues, as
`ServerFacade::SetFacingTo` still sends `SendMovementFlagUpdate` while
bots can have the `MOVEMENTFLAG_ROOT` flag.

src/strategy/actions/AcceptResurrectAction.cpp

@@ -23,7 +23,5 @@ bool AcceptResurrectAction::Execute(Event event)
     packet << uint8(1);                                        // accept
     bot->GetSession()->HandleResurrectResponseOpcode(packet);  // queue the packet to get around race condition
 
-    botAI->ChangeEngine(BOT_STATE_NON_COMBAT);
-
     return true;
 }