Merge #6651

6651: Fix swapping with dragger beams (fixes #6597) r=Robyt3 a=def-

## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Dennis Felsing <dennis@felsin9.de>

src/game/server/entities/dragger.cpp

@@ -218,3 +218,8 @@ void CDragger::Snap(int SnappingClient)
 	GameServer()->SnapLaserObject(CSnapContext(SnappingClientVersion), GetID(),
 		m_Pos, m_Pos, StartTick, -1, LASERTYPE_DRAGGER, Subtype, m_Number);
 }
+
+void CDragger::SwapClients(int Client1, int Client2)
+{
+	std::swap(m_apDraggerBeam[Client1], m_apDraggerBeam[Client2]);
+}

src/game/server/entities/dragger.h

@@ -40,6 +40,7 @@ public:
 	void Reset() override;
 	void Tick() override;
 	void Snap(int SnappingClient) override;
+	void SwapClients(int Client1, int Client2) override;
 };
 
 #endif // GAME_SERVER_ENTITIES_DRAGGER_H